Outlook search shows duplicate results after OST rebuild

Scenario

After rebuilding the local cache, Outlook search returns duplicate items or ghost results.

Recommended Resolution Path

1. Verify the mailbox does not actually contain duplicates in Outlook on the web.
2. Recheck Windows Search indexing scope and clear stale index data.
3. Test search in a fresh Outlook profile if duplicates persist locally only.
4. If the issue follows shared mailboxes, review cached shared folder settings.

Technician Notes

Confirm the result, document the root cause, and record any preventative action worth standardizing.