There are many problem with Outlook 2016 not working. Here's a fix for some:
- -open Outlook
- -go to “File” > “Options” > “Search” > “Indexing Options” > “Modify”
- -uncheck “Microsoft Outlook“.
- -click “Close”
- -close OUTLOOK.
- -navigate to the folder where the OST file lives (“C:\Users\username\AppData\Local\Microsoft\Outlook“).
- -right-click a highlighted file
- -click “Properties“.
- -click “Advanced"
- -checkmark “Allow this file to have contents indexed in addition to file properties” option if it isn’t checked already.
- -click “OK“
- -open Outlook
- -go to “File” > “Options” > “Search” > “Indexing Options” > “Modify”
- -recheck “Microsoft Outlook“
- -click “Close”