Using older versions of Outlook for Mac in business environments
Hello,
I have been experiencing the same issue. It happens occasionally during the day: getting "downloading the attachment from the server" and sent messages getting stuck in Outbox. However, the fix referenced above to change the authentication does not help me since I don't have "More" option in Accounts. My accounts are Google hosted. Outlook Version 16.90.3 running on MacOS 14.6.1. I am able to open a message and push the messages from Outbox by Reset the Account but that helps only once.
Extremely annoying.
Update.
The issue was solved when switching to Legacy Outlook. Apparently something went wrong with New Outlook a week or so ago for Google hosted accounts. This could perhaps help @Microsoft team to find the root cause that seems to affect many users.
Regards,
VV