Outlook is a complex program, in fact, it’s a few programs in one: Mail, Calendar, Contact Manager and Task Manager. As you begin to use it and demand more of the program issues can occur over time such as rebuilding your PST file, migrating emails to a new computer and adding new mailboxes. If you’re having trouble with Outlook 2016 not functioning properly, specifically a mailbox not loading, or a problem with search, then a quick and easy fix is to rebuild the Outlook Search Index. In this article, we show you how to do that. If you are running Outlook 2013, be sure to check out our article for that version here.
Rebuild Outlook Search Index
Go to File > Options and select Search in the right pane.
Next click the Indexing Options button.
Indexing Options will open up…click the Advanced button. Note that this step may require administrator privileges.
Next on the default Index Settings tab click the Rebuild button.
Do note that while the index is being rebuilt searches probably won’t work so just wait until the process completes. The amount of time it takes to complete varies depending on the number of emails, file size, and processing power.
You can see the status of the process will update at the top of Indexing Options window. If there are other apps running in the background, you’ll see Indexing speed is reduced due to user activity.
Once the rebuilding is complete, you’re done! Go back in and do some searches and see what kind of improved speed and functionality you get.