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I'm currently evaluating Zimbra and I think the best way is to start using it live. It easy to migrate from Outlook to Zimbra, but how do I go back? Is it possible to migrate back to Outlook?
Well, Zimbra has both client and server pieces. Outlook is just an email client. The type of email server that you would be moving back to would have a lot to do with migrating back.
I run postfix on a linux server. I use POP3 to download all the mail to Outlook, so no email are stored on the server. If I migrate from Outlook to Zimbra I need be able to migrate back directly to Outlook.
You can use the PST import tool to migrate from Outlook to Zimbra and later if you want to revert to Outlook you can always download the mail via POP3 account.
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Zimbra to Outlook 
Of course I can use POP3 to migrate back!!!!
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