P365: Known Limitation - Expanding Archives
Error in request : 4103 : Target
Error uploading Message Subject :Reconnect Session Request exception : ROP Request error 4103 : Target
Error uploading Message Subject : radio : Id 00000 Reconnect Session Request exception : ROP Request error 4103 : Target
At this present time 'Expanding Archives' (those of 100GB or more) are not supported due to the way that Office 365 spreads the data over multiple mail stores. A workaround to migrating such a significant archive is to either export to PST and import manually via Outlook or reduce the size of it so it will be recognized by Office 365 as a regular Archive and store it in a singular mail store - allowing Power 365 to migrate.
For additional information please read the following technet article:
https://blogs.technet.microsoft.com/exchange/2018/04/09/office-365-auto-expanding-archives-faq/
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