When Outlook search stops showing results, it’s usually an indexing issue.
Go to File → Options → Search → Indexing Options and make sure Outlook is included in the indexed locations.
Click Advanced → Rebuild to refresh the search index (this may take a few minutes).
If you still don’t see results, check the Windows Search service — press Win + R, type services.msc, and ensure “Windows Search” is running.
For Microsoft 365 users, updating Office often fixes search bugs instantly.

Still not searching right? Let our experts remotely repair your Outlook index for you.