Secret Squirrel

This is almost certainly because Google doesn't like your public IP address. Someone with that address at some point abused the system...

Your screenshot indicates that a rogue extension is still the most likely culprit. Did you see my post #3? Try that test before anything...

Hader, as a test, click on the three little dots top right to open the menu, choose "New Incognito Window", then try again from there...

JD, perhaps those email are hiding from you. Try this is in Gmail's Search box at the top: from:me has:attachment If that doesn't help...

OK, you now need to answer my first question.

Ants, I agree. That's why I want to know if he can sign-in to OneDrive and his MS account online. If he can't then it's an account problem.

Do you sign-in to both computers with the same Microsoft account? If you do, then as a test, try to sign-in to these Microsoft services...

Sorry that I couldn't help. Outlook Classic’s old Word‑based rendering engine is almost certainly the culprit.

Thanks for providing details of those events. Sadly, they're not relevant. Outlook Classic and the web version use different renderers...

Open the faulty email again to generate another crash then head over to Event Viewer. Look under Windows Logs -> Application and see if...