So far I am liking Zimbra, but I do have a few features that I miss from Google Apps. I miss the ability to search and apply tags to everything that is already in my account. Zimbra cannot do that, but version 6 should be able to fix that. I miss the linking of messages to one thread in Google, but on the other hand I don't miss it sometimes. That was a controversial function for me.
I miss the extra drive space. My current Zimbra account only gives me 2 gigs. When I am done uploading all my mail I will need closer to 4gig, and Google apps gave me around 7. I knew this going into the Zimbra, but more space would be nice!
I am liking the syncing to my iPhone. The only quirk is that the photo caller id pictures I have on my Mac address book won't sync with the iPhone anymore but they will sync with the Zimbra server. Weird. I am also having issues with getting the calendar on my mac to sync with Zimbra. I was able to do a one way import to the server but getting it back down to my iCal has been a problem. It hasn't bothered me yet since I don't really use iCal as much as I used to now that my work world lives in Exchange.
I have had a few other odd issues with mail not replicating to Outlook using the Zimbra plug in, but I haven't gone crazy over it yet. Overall Google Apps was a good solid web app, so change is difficult. That being said I am happier that I have a bit more control over my most sensitive data. Sorry Google, I love you in many ways but I am still a bit skeptical about your privacy and data retention policies. And in a nutshell that is the final reason I moved to Zimbra. I still use my Gmail account as a backup, but I haven't logged into my Google Apps account all week.
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