Microsoft is investigating multiple bugs in the classic Outlook desktop client that cause group creation failures when Exchange Web Services (EWS) is enabled, Gmail/Yahoo synchronization errors (0x800CCC0F, 0x80070057), and intermittent disappearance of the mouse pointer. Workarounds include using the new Outlook client or Outlook Web Access for groups, deleting affected Identity registry entries for sync issues, submitting diagnostic logs via a Microsoft 365 admin support case, or temporarily restarting or switching apps while Microsoft prepares a REST-based group fix and further updates. #EWS #Outlook
Keypoints
- Classic Outlook group creation can fail with “Can’t connect to the server” when EWS is enabled due to a failing AD Graph ValidateUnifiedGroupProperties call.
- Gmail and Yahoo account sync can return errors 0x800CCC0F and 0x80070057 because users are not prompted to sign in after password changes.
- Microsoft advises using the new Outlook client or Outlook Web Access (OWA) as a workaround for group creation issues.
- Deleting the affected email’s registry entries under ComputerHKEY_CURRENT_USERSoftwareMicrosoftOffice16.0CommonIdentityIdentities is a recommended temporary fix for sync problems.
- Mouse pointer disappearance affecting Outlook and other Microsoft 365 apps should be reported via a support case with diagnostic logs; temporary fixes include restarting or switching apps to restore the cursor.