Everytime I recently tried to do a quick search in my contacts I was getting the following error message:
Instant search encountered a problem while trying to display results. Modifying your query may resolve the problem.
After reading numerous posts about checking the indexing options I eventually solved the problem by doing a repair of my pst file.
- Navigate to the C:\Program Files (x86)\Microsoft Office\root\Office16 folder and run SCANPST.EXE
2. Browse to the location of your PST file which is usually in the following folder:
C:\Users\[your username]\AppData\Local\Microsoft\Outlook
3. If it finds any problems let it repair them.
4. Reopen Outlook and try searching again!