"Never a good idea to have multiple versions of Office on the same PC"
Not all parallel, only one at a time and only for test purposes!


More importantly, the On/Cancel buttons are back and that had nothing to do with Office.
Because the Latitude's screen is relatively small, I increased the scaling from 150% to 175% during the Windows installation, and this means that the two On and Cancel buttons in the Send/Receive window disappear - and only here.
I then increased the scaling on my main computer as well – and the buttons disappeared. There are many windows in Windows, and it's strange that something disappears only in this one Outlook window.


The main thing is that the problem has been found and resolved. I've now unchecked the "Receive Message" box on my second T-Online email and now only receive each email address once. And I've learned something new again.


Hornblower, thank you so much for your support!!!