I have procrastinated long enough. There are enough tickets in my queue at $DAYJOB from clients justifiably complaining about poor email service. Made the ruthless decision to migrate our old legacy mail server to Zimbra over the bank holiday weekend. This is because the old server was running out of space (its never good when you run a /bin/df and use comes back at 99%) and didn’t have all the nice stuff that Zimbra comes with such as spam filtering, ajax interface etc. Plus Zimbra is free of charge, which is definitely a plus.
Its going okay so far; I’ve made use of imapsync to move email across and its quite happy pulling most of the data across.