Microsoft 365

Formerly Office 365

In my opinion Microsoft 365 is the most complete out of the bunch because of the cloud and desktop apps, the easy expandability it brings in combination with Azure and Entra/Intune. I must say that Google Workspace is a close contender but the desktop apps are less complete in my opinion. The pricing is very good even the lowest tier. In my eyes they can't compete.

Thunderbird is very nice tool but in my case not used because I have several issues with his calendar.
Zoom is very good tool, providing you low band usage and good video and sound quality.
I have tested OpenOffice but not nice UI experience.
Slack very good chatting tool with history keeping and huddle for quick audi call.

All the features in Microsoft Office 365 are better than any other product in the market except the protection feature. This is the only weakness in Microsoft 365 where had to stop their protection and buy Proofpoint Advanced Threat Protection.

The Exchange Online feature is better than any other product. I have done so many migrations of mailboxes from different products to Office 365. Simliarly with SharePoint Online and Skype. The MRM policy, Ediscovery, Mail flow, Legal hold and many other features perform better than other products. Overall Microsoft Office 365 is a complete package product. Offcourse there are some limitations but then no product is perfect and always have scope for improvement.

LibreOffice is great for single-users or freelancers, but for organizations Microsoft 365 provide all the components that may be required in a single and unified product.

Its very user-friendly, collaborative and efficient that boosts productivity using cloud tools. their security is strong and it provides data protection. There are regular updates that shields us from attackers too. It offers a wealth of learning resources, including tutorials, help articles and video guide to help users make the most of the application and personally upgrade their skills.