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If you share delegate access to your local Exchange account with others or vice versa, the shared calendar or mailbox may disappear from view and you'll need to supply/be given that access a second time. If you share calendars with others, they will appear as disconnected and may give you errors until those accounts are migrated to O365. Right-click on a calendar and remove it from your view, then re-add it once it has been migrated.

A common example calendar that will need to be reconfigured is "KI: HQ Staff Calendar" or "ki-hq-staff-calendar-res@mit.edu". For instructions on how to do soreconnect this calendar as well as others in Outlook, please see below:

Adding Shared Calendars:

https://support.microsoft.com/en-us/office/open-another-person-s-exchange-calendar-2257f515-408f-48ea-9363-11d0d5848c77

https://support.microsoft.com/en-us/office/open-a-shared-exchange-calendar-in-outlook-for-mac-060b7bd5-de72-421c-be53-e80266468bd2

https://it.cornell.edu/applecal/view-shared-office-365-calendars-apple-calendar

Sharing Calendars/Providing Delegate access: 

https://support.microsoft.com/en-us/office/manage-another-person-s-mail-and-calendar-items-afb79d6b-2967-43b9-a944-a6b953190af5#__add_another_person_s

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