Microsoft has fastened a identified concern affecting Outlook for Microsoft 365 customers since June and inflicting gradual begins and freezes as if Offline Outlook Knowledge Recordsdata (OST) have been syncing proper after launch.
Nonetheless, no new OST recordsdata are generated on affected programs, and there are no further entries associated to this habits within the Utility occasion log.
Affected customers report that Outlook would open promptly in the event that they canceled the appliance after launch. But, Microsoft additionally famous that customers would possibly encounter difficulties beginning the appliance on programs with Airplane mode enabled.
In such cases, error messages appeared, stating, “Can not begin Microsoft Outlook. Can not open the Outlook window. The set of folders can’t be opened. The try to go browsing to Microsoft Alternate has failed.”
These points with Outlook freezing and experiencing gradual begins would happen throughout cache re-priming, a course of triggered when creating new profiles or disabling shared calendar enhancements.
“One identified reason behind this symptom is cache re-priming. That is anticipated if the person has created a brand new profile, or manually toggled from REST to MAPI by disabling Shared Calendar Enhancements,” Microsoft says.
“Nonetheless, as a result of endemic issues in studying service enabled function’s standing in non-Workplace MAPI based mostly functions, operating such apps can power this toggle unexpectedly.”
Fastened in the Beta Channel
The Outlook concern has been resolved in construct 16929.15000 and launched to the Beta Channel. The repair is about to roll out to the Present Channel in late November by builds 17029.20000 and better.
As Microsoft explains, the issues stemmed from Outlook encountering difficulties in figuring out the “default” state of the cache. This confusion arose as a result of non-Workplace MAPI apps equivalent to MFCMAPI and Outlook arriving at completely different conclusions, resulting in surprising hangs and gradual begins.
Affected Outlook customers may work across the concern till the repair lands within the Present Channel by enabling the “Shared Calendar Enhancements” choice within the Alternate Account Settings dialog.
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This may be finished by clicking Extra Settings and deciding on the “Superior” tab; the change takes impact after restarting Outlook.
Moreover, IT directors have the choice to make use of a gaggle coverage setting, enabling Outlook REST calendar-sharing updates, as a workaround on affected programs.
Microsoft has beforehand tackled numerous Outlook points, together with ones in April stopping Microsoft 365 clients from accessing emails and calendars, login issues in October 2022, and a bug inflicting Outlook to freeze and crash instantly after launch in August 2022.
