The result of our testing was as follows: Note that the Microsoft article linked below does not mention UPNs, however we found that special characters in UPNs will cause users and shared mailbox migrations to fail. However, we found during a large migration that in some cases they can be retained. Having spoken to Microsoft about this, the official line is that no special characters are supported, therefore you should remove them if at all possible. You may run into an issue migrating mailboxes from on premise Exchange to Office 365, where some accounts fail due to illegal characters in email addresses or UPNs. There is a PowerShell script at the end of this post which you can use to identify problem accounts before migration. This is a workaround in order to identify and migrate mailboxes to Office 365 which have special characters in UPNs and email addresses.
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