I have install a new Exchange 2016 to migrate from Exchange 2010 SP3. I have a problem is that when I migrate the Mailbox from Exchange 2010 DB to Exhange 2010 DB, the Outlook will be disconnected and the customer cann't use Outlook.
When I migaret back the mailbox to the Exchange 2010, the Outllook will connect and the customer can use it to send and receive email.
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