Use the following suggestions if Outlook is stuck on Trying to connect and you are not receiving email on the Outlook desktop app. Before you proceed, make sure that your internet connection is working fine. You can power cycle your router and see if it helps.

Microsoft is investigating multiple bugs in the classic Outlook desktop client causing email sync failures and server connection errors, disrupting Gmail, Yahoo, and group management functions. Temporary workarounds include using the new Outlook or Outlook ...