There are different steps to take if you are on Windows (you'll need to locate the Search Index) or Mac (use Spotlight). First, let's read about how to check if Outlook is indexing on Windows. A laggy search is one of the most common Microsoft Outlook problems. It may arise at different times, depending on your platform or device. Sometimes, it may be your Outlook app itself that is damaged. Not to worry, you can use the built-in Microsoft Office repair utility to get it back in order.

Out-of-date software and corrupted Outlook profiles are two of the most common issues that can prevent you from sending and receiving email. If you're an admin with multiple users reporting problems, you also should check for service issues with Microsoft 365. This kind of error usually indicates some issues on the disk where your Outlook PST file is located. It can be caused due to improper installation of a program, corruption in the hard drive or registry file, etc. This has nothing to do with the email client