Exchange Mail box move.

We will be moving mailboxs from one exchange server to another one. Thier Mailboxs are quite large. We are discussing whether doing this during the day or at night.

My question is is it possible that users can lose emails sent to them during their mailbox move? If we we would move them at night.
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BrentConnect With a Mentor DevOpsCommented:
http://support.microsoft.com/kb/821829 ( Move process )
http://technet.microsoft.com/en-us/library/cc671168(EXCHG.80).aspx ( high level detail from MS on various topics related to exchange administration )

Essentially, their mailbox is locked while it is being moved.  So any emails directed at them would be held in the delivery queue until such time the mailbox has been successfully moved to the new system.  If a failure occurs and the mailbox is not moved, then the mailbox would be unlocked after the failure and mail would be delivered normally.

Suggestions on moving mailboxes:

1. Make sure that the new server doesnt have any quotas on the mailboxes, before you move them, or you may recieve errors.
2. Make sure to keep the old mail system online until all the users have successfully reconnected to their mailbox via their local client.  The old mail server will point their client to the new server automatically, so no reconfiguration is necessary.
3. Make sure there is plenty of space for the log files before starting the move.

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