(Message store has reached its maximum size) error when a Microsoft 365 user tries to delete an item in Outlook or Outlook on the Web.
https://www.fixya.com/support/t3433702-outlook_pst_reached_max_size_but_cannot Slope Game
As archives are in a separate PST than your Mailbox (Inbox, Calendar, Sent Items, Deleted Items, Contacts etc), you may need to focus on this section to be reduced. Biggest culprit for used space is deleted Items. Empty this by right clicking and select Empty deleted items folder. Once empty, it is a good idea to archive messages in your Sent Items folder to another PST or Personal Folder. Once you have done these steps, right click your Mailbox Account (icon of House with a minus sign beside it - under All Mail items), and select Properties for "Your Mailbox Name" Click Advanced button, and click Compact now. This will compress your PST file, and remove any space once occupied by any moved or deleted messages. This process could take a while, and should not be interrupted.
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