October 17, 2023 at 10:04AM
Microsoft has resolved a known issue with Outlook for Microsoft 365 users that was causing slow starts and freezes. The problem occurred during cache re-priming and was related to difficulties in determining the default state of the cache. A fix has been released in the Beta Channel and will roll out to the Current Channel in late November. In the meantime, affected users can enable the “Shared Calendar Improvements” option or use a group policy setting as a workaround.
Summary: Microsoft has fixed a known issue with Outlook for Microsoft 365 users that was causing slow starts and freezes. The issue occurred during cache re-priming, particularly when creating new profiles or disabling shared calendar improvements. The problem was caused by difficulties in determining the “default” state of the cache, leading to unexpected hangs and slow starts. The fix for this issue has been released in the Beta Channel and is set to roll out to the Current Channel in late November. In the meantime, affected users can enable the “Shared Calendar Improvements” option in the Exchange Account Settings dialog as a workaround. IT administrators also have the option to use a group policy setting for affected systems. Microsoft has previously addressed other Outlook issues in April, October 2022, and August 2022.