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Exchange 2010 – Mailbox Move Request Error property expression isn’t valid

Performing the actual migration is often a moment to cross your fingers … and of course you will receive some errors when you start moving the first mailboxes.

Error:
Property Expression isn’t valid

Luckely, this one can pretty easy be fixed.

Solution:
Follow the following steps:

  • Start the Exchange Management Console
  • Go to Recipient Configuration, Mailbox and find the affected user
  • Go to the Properties Page
  • Check the Alias field for invalid characters and remove them.
  • Select Apply
  • You will get a warning that the user will be upgraded to the current version of Exchange, Select OK
  • Select OK

Now you should be able to move the mailbox to the new mailbox datastore.

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