When synchronizing a mailbox to Office 365 or Exchange 2013 or Exchange 2016 (with MMEX 8.13 only), the mailbox has been processed in a sync collection for days and the progress hasn't moved. Upon reviewing of the Migration Agent for Exchange (MAGE) log file one of the two following messages is displayed.
Warning Item 'AQMkAGI3MmUyMTdiLWIyNTItNGU1OC1iYzRiLWMwYmVkMmNkNGEyNgBGAAADr8==' isn't deleted. Result = 'Error'. ErrorCode = 'ErrorNonExistentMailbox', or
Warning Item 'AAMkAGQxY2M5NDRlLTQ0N2QtNGU4Mi05ZDlmLTk0OTNkNmQwZjQxNABGAAAAAA=' isn't deleted. Result = 'Error'. ErrorCode = 'ErrorAccessDenied' or
Warning Item 'AAMkADlkZTJlNzdmLTY1OWYtNGVhYS04YjljLTdkM2I2YjZlZGMzMABGAAAAAAByR+2uPf3iQ4i+4m7qb+DtBwDRh8R2zoSyQ5ltlyI0m7SbAAAAAAEMAADRh8R2zoSyQ5ltlyI0m7SbAACXm5QfAAA=' isn't deleted. Result = 'Error'. ErrorCode = 'ErrorCannotDeleteObject'.
Warning Item 'AAMkAGUxODIyOTA4LWZiYTAtNGZiMi05OTgxLTAwYTIxOTBmMjY3MABGAAAAAAChrpal5kmTTLZ+mSH+BOgdBwBccQ/t78bMT5j5SIhHATnEAAAAABfvAABccQ/t78bMT5j5SIhHATnEAABGXAwcAAA=' isn't deleted. Result = 'Error'. ErrorCode = 'ErrorInternalServerError'.
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