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Migrating from Zimbra To Exchange is painfully slow

    Question

  • My company is migrating from Zimbra to Exchange 2007.

    The process I have taken thus far is as follows:

    Installed Office 2007 on a Windows Server 2008 VM.

    Add the domain users group to the local administrators group.

    Logged into the VM as each user and configured their Outlook MAPI profile to connect to Exchange.

    Added an IMAP account to their Outlook profile that points to the Zimbra mail server.

    Sync the mail from Zimbra to the Outlook IMAP account.

    Expand the Zimbra account and copy the files/messages from the IMAP account to the Exchange account.

    Then go on vacation...

    My Exchange server is also virtualized on the same ESX host.

    All GB Backbone EqualLogic iSCSI SAN for the VM's, all in all very fast.

    When I try and copy or move from the above mentioned scenario, it crawls!!! WE have monitored the ports on the switch that the ESX servers use and they are high but not flooded. It literally takes hours and hours to copy the email. 

    One user had 12,000 emails (under 6gb mailbox) and it took 7 hours to copy.

    I dont know what is happening when copying or moving the email and how the Exchange server handles that. I looked at the perf mon on all the servers involved and they are not being utilized like you would expect to see given the latency of the copy. 

    Can anyone shed some light on what is happening or possibly suggest an alternative way to get an individuals IMAP account into their Exchange account magically???

    Much Appreciated...

    Sunday, June 13, 2010 1:38 AM

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