Microsoft 365 vs. Slack

Overview
ProductRatingMost Used ByProduct SummaryStarting Price
Microsoft 365
Score 8.6 out of 10
N/A
Microsoft 365 (formerly Office 365) is a Microsoft Cloud subscription service that includes Microsoft Office products (Word, Excel, PowerPoint, OneNote, Outlook, Publisher, and Access). The software can be installed across multiple devices and ensures that users always have the most up-to-date version of the included Office applications.
$5
Per User Per Month
Slack
Score 9.1 out of 10
N/A
Slack is a group messaging or team collaboration app that aims to simplify communication for businesses. Features include open discussions, private groups, and direct messaging, as well as deep contextual search and message archiving, and file sharing. Slack integrates with a number of other tools, such as MailChimp, Dropbox, and Google Drive. Slack was acquired by Salesforce in December 2020. The product is free to use, and also has paid plans with more features and greater controls. The…
$8.75
per month per user
Pricing
Microsoft 365Slack
Editions & Modules
Business Basic
$5.00
Per User Per Month
Individual
$5.84
*Per Month
Business - Apps
$8.25
Per User Per Month
Enterprise - F3
$10.00
Per User Per Month
Business Standard
$12.50
Per User Per Month
Business Premium
$20.00
Per User Per Month
Enterprise - E3
$32.00
Per User Per Month
Enterprise - E5
$57.00
Per User Per Month
Free
$0
Pro
$7.25*
per month per user
Business+
$12.50*
per month per user
Enterprise
Contact Sales
Offerings
Pricing Offerings
Microsoft 365Slack
Free Trial
NoYes
Free/Freemium Version
NoYes
Premium Consulting/Integration Services
NoNo
Entry-level Setup FeeNo setup feeNo setup fee
Additional Details*When billed annually.*Per active user, per month, when paying once a year. Pro is $8.75 USD per active user when paying month to month. Business+ is $15.00 USD per active user when paying month to month.
More Pricing Information
Community Pulse
Microsoft 365Slack
Considered Both Products
Microsoft 365
Chose Microsoft 365
We actually use all those other tools that I selected simultaneously with Microsoft 365 because of different customers we work with who utilize different sharing/collaborative tools. I think all are equally comparable but Microsoft 365, especially Word, provides the …
Chose Microsoft 365
Office 365 does what it does very well -- and nothing more. It is simple to implement across an organization and then share files and results, as well as organizing contacts and calendars.

However, Google Drive, iCloud Drive and Dropbox all also offer seamless cloud file-sharing …
Chose Microsoft 365
WPS Office and Libre office are very strong competitors in terms of providing highly cost effective and convenient tools for general office productivity and performance however the Microsoft 365 platform seems to have better aligned their user interfaces and GUIs which are very …
Chose Microsoft 365
Typically I prefer working with companies with Microsoft 365 as their main tool because they're usually a fast growing company with a global presence. I like using it for work because it's easy to collaborate, share, review, comment, reply in any of the tools. The mobile app …
Chose Microsoft 365
Microsoft has serious usability issues compared to Google products. Interfaces are cluttered, unintuitive and not easy to use. Compared to the offline version of the office products, 365 online truly disappoints.
Chose Microsoft 365
Compared to Docs & Sheets, Microsoft Word, Excel, and Sheets offer more functionality. Notepad is almost always pre-installed on Microsoft Word-enabled computers. This alternative to Microsoft Word isn't as robust, but it's free. Microsoft Publisher is incompatible with Adobe …
Chose Microsoft 365
Microsoft set the standard by creating the suite of software that's included in MS 365. The software totally ubiquitous, with everyone from entry-level employees to seasoned executives being familiar with how it all works. It's also the gold standard worldwide, which means that …
Chose Microsoft 365
I was not part of the selection process, however, I feel that it just makes sense for us to use Microsoft 365 rather than any other software out there. They are the industry standard for a reason, it has been around for a really long time (Microsoft Office anyways) and has a …
Chose Microsoft 365
The programs in Microsoft 365 [I feel] are certainly better than Google Drive, as Microsoft Word and Excel have more features than Docs and Sheets. As Notepad is included with most machines, it is certainly limited so Microsoft Word runs circles around it. However, [I feel] …
Chose Microsoft 365
Because of the ability to connect applications, Microsoft 365 seems to be more robust on the communication platform. Google Workspace has a few other benefits of the automatic Google drive synchronization, but outside of that, Microsoft easily makes it easier to choose with its …
Chose Microsoft 365
MS 365 does everything all at the same time. It's the platform, the cloud, the messaging, the task management, the document creation, editing, sharing, the screensharing, the whole thing. There's just nothing that competes in a meaningful way with MS 365. I think GSuite is …
Chose Microsoft 365
Stability, high security, unique capabilities, speed of execution, cloud storage space, and compatibility and integration with other software has made this Microsoft product one of the best in the competitive market.
Chose Microsoft 365
I like these applications, but Google does them for free. You can't beat that. I still use OneNote frequently, but for most work, Google is a winner here.
Chose Microsoft 365
The only other software I have used similar to Office 365 is G Suite (Google docs, sheets, hangouts, etc.). Hangouts is buggy and does not compare to Teams at all. Teams is superior. The other apps are comparable, but there are no native applications to install and if they are …
Chose Microsoft 365
Was a company wide decision, but both of the products are well designed for thier purpose. I quite like the integrated calendar of Office 365 however I used Gmail at most of my previous workplaces.
Chose Microsoft 365
I don't think that Microsoft Office 365 stacks up particularly well against Google Suite, but I wasn't involved in the decision making. I suspect that the appeal is mostly driven by a "simplified" migration from legacy Microsoft systems into Office 365, but I would say that it …
Chose Microsoft 365
Office 365 is a more powerful platform. Google offers a cleaner UI, but Office allows you to get things done.
Slack
Chose Slack
In my opinion, the closest to Slack in terms of UI is Discord. But Slack is much more professional with more functionalities that doesn't require very technical knowledge (good for our older staff who began their digital journey within the last decade). In terms of workflow …
Chose Slack
Ease of use is a game-changer. Slack works so intuitively. People started collaborating automatically, and digital communities started to appear. We haven't seen that kind of engagement with other tools or workflows. It makes working together fun, and that is something that …
Chose Slack
More user friendly and easier to collaborate
Chose Slack
Slack is hands down a winner compared to these other tools. Simplicity and user choice win out every time. Also, add that it has a ton of great integrations, which means it is more than just a messaging app. It can allow you to organise your day, remind people in your team to …
Chose Slack
Microsoft Teams is the closest alternative. Its ability to link up with the calendar is useful. However, Slack is on a different level in terms of usability and functionality to be able to integrate with different softwares.

WhatsApp Business doesn't have the same function as …
Chose Slack
Favourably compare to all other tools I use.
The fact that LinkedIn and Facebook now have so much advertisment make Slack a much better choice.
Mighty Networks is amazing but way more difficult to set up and administer!!!
Chose Slack
Slack complements our current technology stack. We use Microsoft products for most tasks, but we have found Teams and Slack to be more user-friendly and reliable than Microsoft Teams. It is easy to manage and add/remove users. It is easy to search and find answers to questions …
Chose Slack
While teams is better for conference calls and telephony, Slack surpasses it with it's ease of use, integration possibilities and search capabilities. Having one place where all your collaboration takes place, together with notifications and alerts from all other portals is …
Chose Slack
Slack is much more modern and sleek compared to both Webex Chat and Microsoft Teams. Slack is specific for what the purpose is, and it doesn't over engineer too many other features.
Chose Slack
Slack is 1000 times better that Microsoft Teams in my opinion. I find teams very outdated and not visually appealing. It almost looks likes its from the early 2000s. Slack is much more modern and sleek. Better emojis and reactions with Slack. Also even easier to navigate than Mi…
Chose Slack
i didn't choose Slack - Slack chose me. i am familiar with Skype but i don't know all its functionalities so i cannot say if Slack is better or not. i feel like Skype lags a lot and takes up too much space when replying to another message. Rocket.Chat is great. it could have …
Chose Slack
Skype is a decent product but I do not feel it has the usability that Slack has. I have also found Skype to be buggy for team collaboration. I also found it to have connection issues and needed to be restarted often.
Chose Slack
The feature set of the chat capability in GoToMeeting is quite limited, fine for basic communication but not much else.

Discord is a fine tool for online communities, but the lack of control over the data and environment makes it a less than ideal business tool (if something is …
Chose Slack
Microsoft Teams is mostly for working in development teams and really not suitable as normal day to day messaging/collaboration tool.
Skype for Business is reliable but not suitable for code management and has very high costs for movement to cloud.
Cisco Teams is mostly suited …
Chose Slack
Slack having the ability to be multi-tenant and multi-company is what it really sets itself apart from the rest of the competition out there.
Chose Slack
We selected Slack because HipChat was being deprecated, and we needed to migrate to something else. Slack was the closest product in comparison to what we had tested. There were pains in migrating, but after all, was completed, it was pretty close to the same functionality and …
Chose Slack
I prefer Slack over both of these because it feels fresh, casual and fun. I'm not going to choose this type of medium for connecting with C-Suite members anyways so I enjoy the fun features that Slack provides. Compared to Skype and ShoreTel, Slack has a much better look and …
Chose Slack
Slack is better for group communication. Information is not lost somewhere once you close it. In Skype, your missed or finished chats are saved in Outlook folder and it is hard to find the one you are looking for. In Slack you just scroll.
It, however, does not have calls and …
Chose Slack
Slack is a bit more simplistic than the other pieces of software, but creates more meaningful conversations. The other programs create more of a forum based platform, than a social network like Slack. Slack encourages everyone to get involved with the conversation as opposed to …
Features
Microsoft 365Slack
Project Management
Comparison of Project Management features of Product A and Product B
Microsoft 365
-
Ratings
Slack
8.0
625 Ratings
3% above category average
Task Management00 Ratings7.8428 Ratings
Gantt Charts00 Ratings6.961 Ratings
Scheduling00 Ratings7.8361 Ratings
Workflow Automation00 Ratings8.1394 Ratings
Mobile Access00 Ratings9.4598 Ratings
Search00 Ratings8.3605 Ratings
Visual planning tools00 Ratings7.4273 Ratings
Communication
Comparison of Communication features of Product A and Product B
Microsoft 365
-
Ratings
Slack
8.8
633 Ratings
10% above category average
Chat00 Ratings9.6632 Ratings
Notifications00 Ratings8.9629 Ratings
Discussions00 Ratings9.3617 Ratings
Surveys00 Ratings8.2410 Ratings
Internal knowledgebase00 Ratings7.8409 Ratings
Integrates with GoToMeeting00 Ratings8.9110 Ratings
Integrates with Gmail and Google Hangouts00 Ratings8.7182 Ratings
Integrates with Outlook00 Ratings8.9120 Ratings
File Sharing & Management
Comparison of File Sharing & Management features of Product A and Product B
Microsoft 365
-
Ratings
Slack
8.5
600 Ratings
6% above category average
Versioning00 Ratings8.2324 Ratings
Video files00 Ratings8.3538 Ratings
Audio files00 Ratings8.5525 Ratings
Document collaboration00 Ratings8.0426 Ratings
Access control00 Ratings8.3409 Ratings
Advanced security features00 Ratings8.3360 Ratings
Integrates with Google Drive00 Ratings9.0211 Ratings
Device sync00 Ratings9.0452 Ratings
Best Alternatives
Microsoft 365Slack
Small Businesses
Google Workspace
Google Workspace
Score 9.1 out of 10
Stackby
Stackby
Score 9.0 out of 10
Medium-sized Companies
Google Workspace
Google Workspace
Score 9.1 out of 10
Troop Messenger
Troop Messenger
Score 9.8 out of 10
Enterprises
Microsoft 365 Business Premium
Microsoft 365 Business Premium
Score 8.9 out of 10
HCL Connections
HCL Connections
Score 9.0 out of 10
All AlternativesView all alternativesView all alternatives
User Ratings
Microsoft 365Slack
Likelihood to Recommend
8.0
(242 ratings)
9.2
(631 ratings)
Likelihood to Renew
9.5
(6 ratings)
10.0
(25 ratings)
Usability
7.7
(13 ratings)
9.0
(248 ratings)
Availability
-
(0 ratings)
10.0
(2 ratings)
Performance
-
(0 ratings)
10.0
(2 ratings)
Support Rating
8.9
(54 ratings)
9.9
(68 ratings)
Implementation Rating
9.0
(2 ratings)
8.8
(5 ratings)
Configurability
-
(0 ratings)
10.0
(2 ratings)
Contract Terms and Pricing Model
-
(0 ratings)
10.0
(1 ratings)
Ease of integration
-
(0 ratings)
9.0
(2 ratings)
Product Scalability
-
(0 ratings)
10.0
(1 ratings)
Professional Services
-
(0 ratings)
10.0
(1 ratings)
Vendor post-sale
-
(0 ratings)
10.0
(1 ratings)
Vendor pre-sale
-
(0 ratings)
10.0
(1 ratings)
User Testimonials
Microsoft 365Slack
Likelihood to Recommend
Microsoft
Microsoft 365 would be well suited for medium to large enterprises. This is where there are several hundreds or thousands of people. Since most everyone has used one of the applications the learning curve would be reduced. Another reason would be the ability to implement security measures to prevent access to sensitive data. This could justify the cost of an Enterprise license.
Read full review
Salesforce
Slack is great for tracking commits to new coding projects. You can take parts of code that still need to be implemented later and easily search through the history of comments if there is something that goes wrong with a code commitment. It can be difficult for people that only like Teams to adjust to a new platform if you are using both to communicate.
Read full review
Pros
Microsoft
  • Chat with teams and the integrations with the other apps, and many more smaller ones, like to-dos, news, and the recent Outlook integration.
  • Easy embedding on SharePoint to broadcast all the content created in the different tools.
  • The office package is still robust with the good things from the past and new additions.
Read full review
Salesforce
  • Huddles Run smoothly without any interferences.
  • Smooth individual calls quick and easy without any interruptions.
  • seamless notifications across multiple devices
  • The ability to easily tag a team member to urgently attend to a specific escalation.
  • Slack being user friendly and able to integrate easily with other platforms and apps.
  • How to easily open up different channels for different escalations and needs.
  • a safe direct messaging option.
Read full review
Cons
Microsoft
  • Forms lack comprehensive features and parameters for detailed questioning for example cannot be directly linked with Power BI
  • Outlook email filters are not handy to use and require more detailing in terms of location past emails
  • Teams requires substantially large amounts of system resources which could be finetuned
Read full review
Salesforce
  • Would love a better integration with GitHub. For example, notifications when your PR is updated, when review is requested, @-mention in comments, etc.
  • Improved "Later" tab, for example the ability to create to-do lists or making the "Later" tab into a more powerful to-do list (annotate items with notes)
  • More powerful integrations, e.g. Google Calendar could render a calendar view within Slack, rather than sending the daily schedule
Read full review
Likelihood to Renew
Microsoft
So far the Microsoft 365 platform provides features and tools that can cater to 100% of present organizations needs considering both technical and business necessities, however most features are not been effectively utilised at present. The current featureset is able to cover for most of the future needs of the business and technical functions.
Read full review
Salesforce
To be more transparent, I give 10 because Slack serves our collaboration needs. It provide us a good platform for team communication relaying important update within the company, it has even mobile app where you can install in your phone to monitor any updates within that team that needs your immediate attention and intervention.
Read full review
Usability
Microsoft
Microsoft 365 is the gold standard for performing project tasks in a professional environment, enabling the quick transfer and exchange of files and ideas for team members who work locally and remotely. Its suite of tools is familiar and has evolved to being cloud based, allowing for files to be updated in real time from near and far.
Read full review
Salesforce
My rating was 7. Its intuitive interface and user-friendly features like channels, threads, and integrations make it excellent for team communication and onboarding. However, its usability is held back by the resource-intensive desktop app and cluttered feeling in large workspaces. The mobile app's performance and unreliable notifications have also been noted as weaknesses.
Read full review
Reliability and Availability
Microsoft
To-date Microsoft 365 platform has offered an amazing uptime and availability percentage per year compared to all other products which provide the stability and overall business resilience of their ecosystem which is a great relief for information technology service entitites which heavy rely on Microsoft offerings as a whole to redeliver their own custom products
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Salesforce
Yes, the app works 24/7. I don't even recall having any period that we could not use since the implementation. Even the maintenance periods are barely noticeable and our work is not impacted by it when it happens.
Read full review
Performance
Microsoft
The Microsoft 365 tools expects and demands a substantial amount of system resources to operate at optimal level and even more when integrated with other applications which is a downside, however given that external supporting tech factors such as fibre/broadband speed bandwidth, high speed RAM and ample storage resources are allocated the tools work error free providing robust communication
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Salesforce
Slack is a soft app, we don't have many issues with it. I recall one or two people complaining about something during our usage period, but I didn't have a bad experience. When the app is slow, usually the problem is with my computer or my internet. The app works just fine.
Read full review
Support Rating
Microsoft
Over the past 8 years of using Microsoft 365, I have noticed that they change vendors often. This always leads to a poor experience in the beginning, then levels out after some time for the company to get things worked out. As a customer, it is really frustrating because I don't have time when something isn't working to have them "look into my issue" and get back with me. They have even closed a ticket I specifically told them to keep open. Your applications are only as good as the support.
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Salesforce
Whenever I've had to troubleshoot an issue with Slack (which, to be honest, has not happened very often), their online documentation has been easy to locate, easy to understand, and effective in resolving my issue. Slack's ever-growing popularity also means that there's a large community of practice out there that can be depended upon.
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In-Person Training
Microsoft
The resellers involved with selling Microsoft products are reluctant to provide in person specialist trainings to consumers due to the fact of costs of economies of scale and is not provided free of charge most of the time. In Person trainings needs to be agreed to at the initiation of projects and implementations for better ROI.
Read full review
Salesforce
No answers on this topic
Online Training
Microsoft
The standard training offered with 3rd part resellers are fairly standard and covers the basic workability however the trainings needs to be specifically customised according to unique requirements of the organizations. for example an MSP would need to master specific communications verticals within Microsoft 365 whereas and online store using Microsoft 365 would needs to master a different set of tools within the suite to get the best ROI post implementation.
Read full review
Salesforce
No answers on this topic
Implementation Rating
Microsoft
The Microsoft support partners are more than capable of handling implementations and dealing with unprecedented errors during the implementations. Not part of the implementation though the setup was done with minimum misconfigurations which is evident with present live setup which works fine without any bugs and gaps at present context.
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Salesforce
I was not part of the implementation team, but I recall being 100% happy and excited to learn and use a new tool. I'm still am to be honest.
Read full review
Alternatives Considered
Microsoft
Typically I prefer working with companies with Microsoft 365 as their main tool because they're usually a fast growing company with a global presence. I like using it for work because it's easy to collaborate, share, review, comment, reply in any of the tools. The mobile app for Outlook and Teams are lifesavers when we're constantly traveling and you can join meetings on the mobile Teams to never miss a beat.
Read full review
Salesforce
I like Slack better than ClickUp, because I would spend 30-60 minutes a day updating my ClickUp tasks. The way ClickUp was used was very micromanaging. I billed by the hour, so I was willing to put in the time to alert the boss what tasks I was working on.
One of my jobs used Hive - I mostly just ran it in the background in case anyone messaged me. I did not use it often.
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Contract Terms and Pricing Model
Microsoft
Microsoft pricing is not very expensive and yet not very cheap as well, and it hovers in between the baseline. The charges are mostly based on the tier level partners who charge based on their individual reputation in the market. Power negotiation will lead to cost effective and attractive pricing
Read full review
Salesforce
No answers on this topic
Scalability
Microsoft
Multiple tools within the same platform have been deployed successfully within different functional technical and non technical teams such as Devops, SOC, NOC, Shared services, Managed services, Global Information technology, Cloud operations, Finance, Administration, human resources and all these teams collaborate while maintaining central uniformity in terms of global standards who are dispersed in different geographical locations with ease
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Salesforce
No answers on this topic
Professional Services
Microsoft
Have not directly obtained professional services from Microsoft but rather obtained specialized services such as implementations and configurations, setting up and integration support with Microsoft authorized suppliers, 3rd parties, and resellers, which has been a pleasant experience. Again the level of delivery quality on professional services is based on the level of hands on exposure of the 3rd party
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Salesforce
No answers on this topic
Return on Investment
Microsoft
  • We have a lot of nonprofit users, so they have a good ROI.
  • I like the constant updates without having to purchase the software repeatedly.
  • I used to purchase each Office (insert year here) often, so the software was up to date and had the newest options and connectors. I think my return on investment would have been much better if Microsoft had updated those versions to keep them current; after all, we did pay for them.
  • Microsoft 365's offering a monthly fee or a discount for a year helps, and you can look at it as a free backup if you have everything set to back up to One Drive. (Cloud-based document filing you can access anywhere ( with an internet connection)—you Can't beat that!)
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Salesforce
  • Slack has been incredibly helpful in connecting various tech apps and ecosystems, creating a more streamlined and responsive process.
  • Slack has made it significantly easier to communicate with our team members across multiple time zones, creating a more engaging environment for our all-remote team.
Read full review
ScreenShots