In some migration projects it is necessary to skip as many attributes from synchronization as possible, so in the Migration Manager user interface all or most of the selectable attributes are skipped. As a result Directory synchronization is not mailbox-enabling the target objects. One of the possible indications of an issue is not limited to, but possibly the following error found in DSA log file:
"Error 0xe1000010. Attribute msExchMasterAccountSid not found in object."
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