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How to Fix Outlook Search Not Working on Windows 10
If Outlook search is not working on Windows 10, first check whether you use new Outlook or classic Outlook. The fixes are different. New Outlook has a Settings option on the ribbon and manages search mainly through its own Search and Offline settings. Classic Outlook relies heavily on Windows Search indexing, so indexing problems are a common reason searches return no results or miss recent messages.
Microsoft's Outlook search troubleshooting guidance recommends checking indexing, Windows Search, profiles, and Office repair. Test search after each fix.
First, check whether you use new Outlook or classic Outlook
If you see Settings on the Outlook ribbon, you are using new Outlook. Go to Settings > General > Search and confirm the search scope you want. If older messages are missing, open Settings > General > Offline and increase Days of email to save, then allow Outlook time to sync.
If there is no Settings option on the ribbon, use the classic Outlook steps below.
1. Check Outlook's indexing status
In classic Outlook, click the Search box, then choose Search Tools > Indexing Status. If Outlook reports items remaining to be indexed, leave Outlook open and wait a few minutes. Check again to see whether the number is falling. Search results can be incomplete until indexing finishes.
2. Make sure the Windows Search service is running
Press Windows key + R, type services.msc, and press Enter. Open Windows Search. Set Startup type to Automatic (Delayed Start) if it is disabled or configured incorrectly, then make sure Service status is Running. Restart Outlook afterward.
3. Confirm that Microsoft Outlook is included in indexing
Close Outlook, open Control Panel, search for Indexing Options, and open it. In the Included Locations list, confirm that Microsoft Outlook appears. If it does not, select Modify and enable Microsoft Outlook, then save the change.
4. Rebuild the search catalog if indexing is stuck
If Indexing Status never reaches zero or the index appears corrupted, close Outlook and return to Control Panel > Indexing Options. Choose Advanced, then select Rebuild under Troubleshooting. Windows will recreate the search catalog from scratch.
Search results may be incomplete while the new index is being built.
5. Update Outlook and Microsoft 365
Open classic Outlook and go to File > Office Account > Update Options > Update Now. Install any available Office updates, then restart Outlook. Microsoft documents this update path in its Microsoft 365 and Office update instructions.
6. Repair Microsoft 365 or Office
If Outlook files or search components are damaged, repair the Office installation. In Windows 10, right-click Start, open Apps & features, select your Microsoft 365 or Office product, and choose Modify. Try Quick Repair first. If the problem remains, run Online Repair, which is more thorough and requires an internet connection.
See Microsoft's Office repair instructions for the supported repair options.
7. If older emails are missing, download more mail
Search can only index mail that is available to the Outlook client. In classic Outlook, go to File > Account Settings > Account Settings, select the account, choose Change, and move Download email for the past farther to the right or to All. Finish the wizard and restart Outlook.
Allow time for the extra mail to download and be indexed.
8. Test a new profile, then repair the data file if necessary
If search is still broken, test a fresh Outlook profile. Use File > Account Settings > Manage Profiles, or open Mail in Control Panel, then choose Show Profiles > Add. If search works in the new profile, the old profile is likely damaged.
If a local .pst file may be corrupted, back it up, close Outlook, and run SCANPST.EXE. Microsoft documents the process in Repair Outlook Data Files (.pst and .ost). Exchange .ost cache files can be recreated from the server.
When search works but a specific message is still missing
Check the search scope before doing more repairs. Try Current Folder or the specific mailbox, and narrow results by sender, subject, or date. Deleted Items can be included through File > Options > Search.
A note about Windows 10
Microsoft ended standard Windows 10 support on October 14, 2025. These fixes still apply to PCs that remain on Windows 10, but Microsoft recommends Windows 11 or an eligible Extended Security Updates path. See the Windows 10 end-of-support guidance.
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