Do note that while the index is being rebuilt searches probably won’t work so just wait until the process completes. Note that this step may require administrator privileges.Ĥ.) Next on the default Index Settings tab click the Rebuild button (B).ĥ.) You will see an dialog asking you to confim the action. Select "Microsoft Outlook"(A) and click the Advanced button (B). The following steps outline the needed tasks (in Outlook 2016 / Office 365).Ģ.) Select Search in the right pane and switch to the search options (A) and click the Indexing Options button (B).ģ.) Indexing Options will open up. Abstract: Sometimes you need to rebuild you Outlook search index in order to solve an error/issue.