One of the customer whom we migrated to Office 365 quite a while back reported an issue where they were unable to delete certain calendar event from Outlook as well as OWA with the following error
“The message store has reached its maximum size. to reduce the amount of data in this message store, select some items that you no longer need, permanently (Shift + del) delete them.”
The action couldn’t be completed. An error occurred on the server.
Upon through investigation and some work with Office 365 support we found out that this issue was because Litigation Hold was enabled for the user and recoverable items exceeded the maximum quote of 30 Gb, As an immediate solution Microsoft Support was able to increase our recoverable quota from 30 GB to 50GB
Feel free to report a new issue on our forum to seek expert help.
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