Hi @Faery Fu-MSFT ,
Sure. The installed version is Microsoft® Outlook® pour Microsoft 365 MSO (Version 2406 Build 16.0.17726.20078) 64 bits. Office tells me it's the latest one.
I've tried your suggestion about a new profile, but something odd happens then when I'm asked to type the password :
The first email adress mentioned above is the one I'm trying to configure, but the second one is the other Exchange email that I've already configurered and which is properly working. I don"'t see any reason why both would be mentioned in this box. Anyway, I've tried both passwords without result!
Besides, when switching to the original profile, I've had to retype the password of the first Exchange email address.
Thanks for your help
Nicolas