it doesnt work properly with pop3 accounts. It is Beta for POP and IMAP.

The IMAP works ..but lot of issues in sync.

A quick search of their website also seems to indicate their Zimbra cloud hosted solution is “fully managed,” and provides support to the end-user, too (an option we chose for the first year with 01.com, even on our own, remotely maintained server). I have heard good things about Perceeva, among other Zimbra host partners, for a list visit Zimbra’s site: http://www.zimbra.com/partners/zimbra_hosting.html

My major issue with it is that it doesn’t seem to understand Gmail’s tags. It has its own tags, but it interprets Gmail tags as directories, and ends up with half a dozen copies of every email. As a result, it doesn’t handle ‘read’ vs ‘not read’ very wel, and I don’t even want to think about what happens when you try to move an email from one directory to another.

Plus, why aren’t Zimbra’s tags global across accounts? A tag created under one account doesn’t appear on another.

When a client of mine wants hosted, I always shoot them to http://www.specialai.com
I’ve used 01.com before but I quite like the personal support you get from SpecialAI. One thing SpecialAI does that I don’t see from any other solution provider is a Fully Managed Zimbra product. This means that not only do they hosted your email, but they’ll provide unlimited administration of your user population plus they provide full help desk support for end users. This is something that most large businesses will definitely need should they decide to outsource email.

If you’re looking for a hosted Zimbra solution, let me encourage you to simply drop them a line. You’ll either find exactly what you’re looking for, or learn a whole lot more than you previously knew about Zimbra. Oh, did I mention that they give you direct contact with the engineer who actually works on your account! Only an in-house IT department can give you that type of service.