Repair your data file If your issue still exists, it may be related to your corrupted data file, please try to repair it to test.Run in safe mode Some Add-ins or custom items also may cause your issue, please try to restart your Outlook in safe mode(Windows R>type "Outlook.exe /safe">enter).Reset Navgation pane Corrupted Navigation pane may cause you couldn't open the Outlook, please try to reset navpane and restart your Outlook to test(Windows R>type "Outlook.exe /resetnavpane">enter).Microsoft 365: Email and calendar issues in Outlook 2303 (Build 16227.Has this issue been occurred only recently? Have you performed any specific operations before it?įor this errors, here are some general workarounds I know: Outlook and Teams to open links soon in Edge by default Microsoft is installing Outlook-Preview without permission Outlook 365 damages PDF and Office files since April 2023 Microsoft Office 2304 (Build 16327.20308): Outlook displays self-signed e-mails as text Final question: Is anyone from the readership affected by this bug at all? In the support article, Microsoft also gives the option to force the use of REST in the Outlook settings (but this enables the "Shared Calendar Improvments" in Outlook). Alternatively, the following registry key: HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Options\CalendarĪnd enter the above DWORD value there. There, the 32-bit DWORD value RestUpdatesForCalendar has to be set to 1 to force the use of the REST API. To do this, open the registry editor and then navigate to the following key: HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\16.0\Outlook\Options\Calendar The reason: Outlook and non-Office MAPI applications like MFCMAPI get different results.Ī workaround is to use the Group Policy setting from the article How to enable and disable the Outlook calendar sharing updates. The whole thing only occurs because Outlook has problems determining the "default" status of the cache. Within the support article Microsoft says, that the Outlook team is looking for a solution to the problem, but it is not yet available. Microsoft says that due to endemic issues with reading the status of enabled features in MAPI-based non-Office applications, however, running such applications can unexpectedly force this switch. This happens if he has disabled "shared calendar enhancements." Microsoft says this is to be expected if the user has created a new profile or manually switched from REST to MAPI. When priming, the cache is filled with data again. Microsoft says that a known cause for this symptom is a re-priming of the cache. The attempt to log on to Microsoft Exchange has failed." They also note that Outlook sometimes refuses to start at all when they have switched to airplane mode, causing this error: Outlook gets stuck at the startup screen for a long time before finally opening and working normally.Įxamining the profile and OST file names, it appears that no new OST files are being created (this would also appear in the application event logs if this were the cause).Īffected people often report that Outlook opens without delay when they cancel the opening and try again. Sometimes Outlook seems to synchronize the entire OST file on all or most startup operations. Microsoft has published this support article dated June 19, 2023, Microsoft states that there are problems with Outlook.
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