Probably an unfair comparison, but Mimecast has some interesting features that MailMeter does not. First, Mimecast is cloud, MailMeter is on-premise. Mimecast has all the same eDiscovery features that MailMeter has, however is also able to offer seamless archive stubbing into …
If you are looking for an onsite solution, MailMeter does the job. Like any program, you will have problems on occasion, however the product is fairly stable. In my opinion, mail archiving is a service that's more suited towards cloud-based services rather than on premise. Much like a spam filter that runs on a Windows server, this product feels like it's from a bygone era.
Of the few times I've dealt with support, I felt like the people who were on the other end couldn't help me. Latest instance was with resolving a license renewal issue, they had to connect me to someone in Ireland and were on a tight schedule to help me during their shift. Come to find that I could not renew a license because their license server was down. In all it wasn't a good support experience, however unfortunately par for the course.
Probably an unfair comparison, but Mimecast has some interesting features that MailMeter does not. First, Mimecast is cloud, MailMeter is on-premise. Mimecast has all the same eDiscovery features that MailMeter has, however is also able to offer seamless archive stubbing into Outlook. Since you don't have to suck up resources on your local network, you easily save money spent on disk/compute resources.