Outlook users may not be able to send emails at the moment. The behavior is caused by a bug that affects classic Outlook.

Outlook is not working since yesterday, I cannot send or recieve emails. People trying to send to me get this: 'STOREDRV. Deliver; missing or bad mailbox database property,' one user tweeted.

We suggest the following fixes if you get This is not a valid file name error in Outlook when sending email: Remove invalid special characters from the file name ...