Outlook Search Not Working
Searching within Outlook returns no results, incomplete results, or misses emails that you can find by scrolling manually.
Quick answer: Outlook search problems are almost always an indexing issue — Windows builds a search index in the background, and if it's incomplete, out of date, or corrupted, search results become unreliable. Rebuilding the index usually resolves it, though it can take a while to complete.
Likely causes
- Outlook or Windows search indexing hasn't finished, particularly after adding a large mailbox
- The search index has become corrupted
- The mailbox is set to search online only, but connectivity to the server is limited
What you can safely check yourself
- Check indexing status in Outlook (File > Options > Search > Indexing Options) — if it says "still indexing," wait for it to finish
- Try rebuilding the index from the same Indexing Options screen if it's stuck
- Try a simpler search term to rule out a search syntax issue rather than an indexing one
When it needs a proper look
If rebuilding the index doesn't resolve it after enough time to complete, that's worth a proper look, particularly on a large mailbox.