Outlook 2025 Shared Calendar Not Updating Automatically. Be aware that there is, or was don't know if fixed, an exchange online service alert regarding shared and delegate calendars not updating. Please kindly try to change the automateprocessing setting in the manager's outlook profile, and then remove and restore the outlook delegate to check.

Right click name select properties then synchronization tab you can see the last time that it was synced click. I am trying to share my work calendar with my partners personal calendar.