Outlook - Rebuild the search index of your mailbox
Issue
These steps can be used if you are trying to search in Outlook for contacts or messages, but no results or incomplete results appear. The steps below will remove and rebuild the search index that each operating system and Outlook use to find content.
Resolution
Outlook for Windows
In Outlook click on the File tab
Then click on Options, then Search
Next click on Indexing Options
You should now see what locations are being indexed, click on the Advanced button
Once the Advanced box has opened you will see in the Troubleshooting section you have the option to Rebuild, click this button
Rebuilding will take some time so make sure you leave your computer on for a while. You can use the computer while the search index builds.
Outlook for Mac
From the Apple menu, choose System Preferences
Click Spotlight
Go to the Privacy tab
Click the plus sign (+) to add a folder to the list of non-indexed folders
Select your Home folder (usually has your name or username and a house icon) and click Choose
If prompted for confirmation, click OK
After a moment, select the item you just added to the list and click the minus sign (-) to remove it
Close Spotlight preferences
Rebuilding will take some time so make sure you leave your computer on for a while. You can use the computer while the search index builds.
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