A Microsoft application for managing email, calendars, contacts, and tasks across devices and platforms.
TL,
In Outlook click File, Office Account and let me know the version listed there under Subscription Product.
What specifically is search not working on? Is it a POP account or a PST file you created to move data to?
Can you please try creating a new Outlook Profile and see if the problem still repros, https://support.office.com/en-us/article/Create-an-Outlook-profile-F544C1BA-3352-4B3B-BE0B-8D42A540459D.
I worked with the product team on the original bug and the repro machine they used to debug it is running the 8067.2103 build and I am not seeing the issue. Once I know what build you are on I will try changing to that build and double check.
Edit to add this link which was the original issue, https://support.office.com/en-us/article/Outlook-search-stops-working-after-updating-to-build-7870-2020-and-higher-0bcf0b06-320d-40c3-8cf0-7e3df90793ed?ui=en-US&rs=en-US&ad=US.