Hi,
Thanks for your answer.
In between, I have upgraded my PC from win 10 to Win 11, after formating my C: because I was unable to upgrade normally from win 10: (for info, the error message was "2021-11-05 13:09:22, Error [0x08085f] MIG MigHost: CMigPluginSurrogate::LoadAndRegisterServerInThreadContext: LoadLibraryExW(C:\$WINDOWS.~BT\Sources\ReplacementManifests\Microsoft-Windows-RasServer-MigPlugin\RasMigPlugin.dll, LOAD_WITH_ALTERED_SEARCH_PATH) failed gle=0x7f.[gle=0x0000007f")
Saying so, when I mention my SSD, I am talking about the "hard drive" in my Surface pro.
After the upgrade, I have still the same message stating that "Outlook cannot connect to a file on internet".
So, I moved the file to another partition, it worked, but, still it is very strange!
Anyway, thanks for your help.