Outlook search does not work sometimes because of outdated program or indexing error. It might be due to some other issue. Here’s how to enable search not working in Outlook. Go to the file menu and then click on options. Select the option of customize ribbon. You will see many commands and tabs in thai section. Select the main tab. A windows would open where you have to click on search. Thereafter, click on add and then button. At last click on ok to save the change and customization you have done. visit here: https://contactforhelp.com/blog/how-to-fix-outlook-search-not-working/