CalCheck is a program that checks your Outlook calendar for problems, and performs various checks on general settings, such as permissions, free/busy publishing, delegate configuration, and automatic booking.

You can use the Inbox Repair tool (SCANPST.EXE) to diagnose and repair errors in your Outlook data file. The Inbox Repair tool checks the Outlook data files on your computer to see if they're in good shape.

Outlook crashes even though you aren't actively using it. Outlook crashes when you start it. Try steps 1 through 3 in order until the issue is cleared. If you go through all of those steps and Outlook is still crashing or not responding, complete step 4 before contacting the Microsoft Community for further help.

For issues that are not covered on this page, we have multiple tools to help you automatically diagnose and fix a range of classic Outlook problems. Check out this article: Resolve Outlook for Windows issues with automated troubleshooting tools.

Right-click the Start button (lower-left corner) and select Apps and Features on the pop-up menu. Select the Microsoft 365 or Office product you want to repair and select Modify. Note: This will repair the entire Office suite even if it's just one application you want to repair such as Word or Excel.

To install a standalone version of classic Outlook for Windows, select your language from the dropdown, and then select Download. Follow the prompts to complete the installation. Which language do you need? Tip: You can also try installing classic Outlook from the Microsoft Store.

Use the classic Outlook startup troubleshooter to diagnose and fix several common classic Outlook for Windows issues for you. Select the button below to start the classic Outlook startup troubleshooter. You need to be on Windows 10 or higher to run the troubleshooter.

Use the Microsoft 365 network connectivity test to measure connectivity between your device and the internet, and from there to Microsoft’s network. View troubleshooter results. After you run any troubleshooter, Get Help provides details on any findings and suggestions for possible remedies.

Find how-to articles, videos, and training for Microsoft Copilot, Microsoft 365, Windows 11, Surface, and more.

If you can’t install, uninstall, or update a desktop program in Windows 10, the Program Install and Uninstall troubleshooter can automatically fix common issues such as corrupted registry keys or incomplete uninstall data.