Users should make sure file extensions are not written in capital letters. Credit: Microsoft.com A bug in version 2409 of Microsoft 365 can cause Word documents to be deleted instead of saved, Microsoft has warned. The bug affects files that contain the # character or have file extensions in uppercase, such as .DOCX or .RTF. Until the company releases a permanent fix, users are being urged to check whether missing files they thought had been saved instead wound up in the Recycle Bin. An alternative solution is to roll back Microsoft 365 to an older version, according to Bleeping Computer. SUBSCRIBE TO OUR NEWSLETTER From our editors straight to your inbox Get started by entering your email address below. Please enter a valid email address Subscribe