The following may be the reason why Outlook is not working properly on your computer. -Restart Outlook using Task Manager. -Update your Outlook application. -Windows Search Troubleshooting. -Checking Microsoft Outlook indexing. -Outlook Index settings check-up. -Configure Outlook Indexing Option. -PST file repairing. -Registry Editor Checking. -Check Outlook group policy settings -Uninstall Outlook and Install it again.