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Symptoms 

While you migrate users to Exchange Online, an E-Discovery search fails and returns a "Deserialization of type Microsoft.Exchange.Data.ExchangeObjectVersion blocked due to NotInAllow at location MailboxDataStore." error message. This error occurs because E-Discovery search requirements block the mailboxes from being migrated. 

Resolution 

To fix this issue, install the following cumulative update, as appropriate:

References

Learn about the terminology that Microsoft uses to describe software updates.

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