Using Classic Outlook on Windows for personal email, calendar, and contact management
Try this as per Microsoft
Thank you for your patience with me. Copy the text below and paste it to the Notepad file, then click on 'File' > 'Save as' and select your Desktop. Lastly, save it with the name 'Outlook.reg' (without the quotes) as a REG file. Note: Please remove the extension '*.txt', while saving the file.
Windows Registry Editor Version 5.00
[HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\ExperimentEcs\Overrides] "ofqmojruwvzbn60"="false"
Lastly, double-click on the REG file (Located on your Desktop) to merge it and restart your computer. After the change, please restart the PC and let us know the result.
Hmm didn't work for me. Followed the instructions merged it successful and rebooted but emails from QB still don't save.
Not sure if I did something wrong.