Are you sure the PST migration tool requires an Exchange server? It's been a while since we did our migration, and we didn't end up using the PST tool, but I do seem to remember testing it and we don't have an Exchange server.
Probably not a good solution if you've got a ton of users to migrate, but you can set-up an IMAP account in Outlook pointing to your Zimbra server, and simply copy-and-paste / drag-and-drop from your existing accounts to the Zimbra server. If you go with this method you might want to search around the forums to see if there are any known "gotchas". You might also want to test with a few emails first before copying your entire mailbox. |