This article describes a 3-step process of moving mailbox data:
within one organization. The steps are:
Important: by design, both Exchange and POP/IMAP users are assigned an x500 Exchange address which is used for internal delivery by Exchange servers and is associated with an Active Directory object (not an email address). When you delete a user, their x500 address is deleted with the AD object, but it can remain associated with email addresses in Outlook and Webmail cache. If you receive the #550 5.1.1 RESOLVER.ADR.ExRecipNotFound non-delivery report after the conversion, try the following solutions:
Converting a POP/IMAP mailbox to Exchange
To convert a POP/IMAP mailbox to Exchange:
Converting an Exchange mailbox to POP/IMAP
To convert an Exchange mailbox to POP/IMAP:
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