Welcome to the light.
We have a had a couple of Kerio clients and frankly it was such a pain. The Zimbra experience is overall much better for everyone involved. Generally we handle migration from IMAPSync (
http://wiki.zimbra.com/index.php?tit...nded_Method.29) . I imagine though if you are in Outlook (our Kerio folks were Macs), couldn't you export email/calendar/contacts to a PST file and then use the Zimbra PST import tool?
As for Blackberry support, for now you will need to look at Notify's solution. It works, but if you are use the true BES experience, it does take a little getting use to.