Outlook for Mac 2019 - Search not working :-(

After uninstall, reinstall, removing accounts, adding and the removing main profile from spotlight search i still did not have a solution. I then noticed new emails were showing up in search, just not emails that were prior to the OS upgrade and restore.

I opened terminal.

CD to folder containing "main profile" i.e. 

/Users/<your user name>/Library/Group Containers/UBF8T346G9.Office/Outlook/Outlook 15 Profiles/Main Profile.

I then used touch to update the access date on old mail. on the CLI I used:

find . -type f  -exec touch {} +

After this finished all my old mail began to appear in searches.

Hope this works for others.