For how long? Outlook does some housekeeping the the PST/OST file on your computer after you close the client itself. I've seen this take more than a minute in certain rare cases.

Some Outlook users have reported experiencing the Out of memory or system resources error on Windows 11/10. Outlook crashes and closes as this error is triggered. The ...

Just a couple of days ago, Microsoft confirmed that certain Office apps could crash when doing mundane tasks, such as typing or spell-checking. According to Microsoft, the bug affects Office version ...