Microsoft Purview Troubleshooting: "Mailbox is Full" Warning Even if the Mailbox hasn't Reached Storage Limit
Symptoms A user may experience following symptoms: First- The user receives a "mailbox is full" warning message for a mailbox that hasn't reached the storage limit. Second- When the user deletes email messages, "The operation could not be completed" warning message is displayed. Third- The user can't change or accept a calendar invitation. Cause If the mailbox size is greater than the mailbox quota, this problem arises. As it excludes the Recoverable Items folder, the user's view of the mailbox size is inaccurate. Users cannot see this folder. Resolution Here is how to resolve this issue: Verify the storage quotas of the user's mailbox by running the cmdlet- Get-Mailbox user@contoso.com | fl ProhibitSendReceiveQuota , RecoverableItemsQuota Then, verify the status of the mailbox quota by running this cmdlet- Get-MailboxStatistics user@contoso.com | fl StorageLimitStatus , TotalItemSize , TotalDeletedItemSize If the StorageLimitStatus value isn...