I received an excel file attached to an email from someone that I regularly receive files from. When I tried to open it a Microsoft notification box popped up saying the file was corrupt and couldn't be opened.

I tried saving the attachment to my laptop, but the same thing happened. Another person received the same file and they were able to open it.

I tried a little experiment. I sent myself one of my own files as an attachment to an email. I was not able to open the attachment - same corrupt file notice.



Any ideas as to what's going on?

I just upgraded my computer to Windows 10
I use Office 365

How are you accessing your email?

Do you have a different email address you could forward the email to, and see if you still have the problem?

Was that the same file type, eg XLSX? If yes, send yourself a different non-Office file, eg TXT.

Trying to narrow down which app is the problem…

That suggests a system change somewhere, probably security related, especially if you came from Win7 or earlier.

Check the Protected View in the Trust Center. Disable all the protections, & close all Office programs. Try again.
If that solved it, you probably want to re-enable the protections once you've saved the file—they're there for good reasons.

Thank you... I got support from Microsoft and I think I'm all set

Would you care to share the secret?
There could very well be other people with the same problem that would love a solution.
Thank you in advance