We have a user with E3 assigned to the user (Exchange Online Plan 2 - Office 365 E3) however in the Exchange Admin Mailbox usage it is only showing a 49.5GB mailbox maximum size. I have a support ticket with Microsoft and the solution provided is "After further review on the case, you'll have to Enable Auto-Expanding Archiving within the PowerShell. This document "https://docs.microsoft.com/en-us/microsoft-365/compliance/enable-unlimited-archiving?view=o365-worldwide", under "Enable Auto-Expanding Archiving for Specific Users. This is the only way to increase the Exchange mailbox from 49.5Gb for the User."
It is true, that the user has had an Archive enabled and that is currently at 92% of 100GB with the main user mailbox is showing 32% of 49.5GB. At the moment, I am currently thinking to stop the automatic default retention tag policy from continuing to process the user mailbox by setting the Retention Period to Never on the "Default 2 year move to archive" tag to prevent the archive reaching 100GB and then if the main user mailbox is then showing 100GB rather than 49.5GB, this will provide a buffer and some time to change how that mailbox is managed in terms of attachments etc. I have seen "Enable-Mailbox <user mailbox> -AutoExpandingArchive" option to allow the archive to go over then 100GB limit, however I do not like the idea of the it automatically re-organising the mailbox with time based folder names and making it non-recoverable and "you can't use the Recover Deleted Items feature to recover an item deleted from an auto-expanded storage area" and "item counts ...could be inaccurate" etc. I found these caveats in https://docs.microsoft.com/en-us/microsoft-365/compliance/unlimited-archiving?view=o365-worldwide
To summerise, does the Microsoft advice seem correct that the use of the AutoExpandingArchive is the only way to have an E3 User Mailbox quota change from 49.5GB to 100GB?
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