Using classic Outlook for Windows in business environments
What SKU of Office do you have? Are you using Office perpetual or Office subscription? The solution in this thread is for Office perpetual Outlook 2019 or Outlook 2021.
To go back to Current Channel do the following:
Use a registry key to switch back to Current Channel, Use a registry command to install Microsoft 365 Insider on Windows devices - Microsoft 365 Insider | Microsoft Learn.
- Open a Command Prompt in Administrator context (Run as administrator)
- Type/paste the command below and press Enter:
reg add HKLM\Software\Policies\Microsoft\office\16.0\common\officeupdate /v updatebranch /t REG_SZ /d Current
- From Outlook click File, Office Account, Update Options, Update Now.