Overview
This article describes the cross-permissions behaviour between Exchange Online and Exchange On-Premises. While the majority of users will be migrated over to Exchange Online collectively, there may be some edge cases of which both parties should be aware.
- Location/Resource Account Access
- Send on Behalf, Send As Permissions
- Delegate Permissions (Calendar and Respond to Invitations on Behalf of)
- Calendar Sharing
- Folder Permissions (Not Supported)
Details
Cross-Permissions Behaviour
1. Location/Resource Account Access
- Owner refers to the owner of the location or resource account
- Delegate refers to a location or resource account
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Owner: M365
Delegate: M365 |
Owner: M365
Delegate: On-Prem |
Owner: On-Prem
Delegate: M365 |
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| Outlook PC |
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| Outlook Mac |
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- Green = Owners can log into the location/resource account
- Red = Owners cannot log into the location/resource account
2. Send on Behalf, Send As Permissions
- Send on Behalf: Messages sent by delegate have "<delegate> on behalf of <mailbox>"
- Send As: Messages sent by delegate appear to come from the mailbox
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Owner: M365
Delegate: M365 |
Owner: M365
Delegate: On-Prem |
Owner: On-Prem
Delegate: M365 |
| OWA |
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| Outlook PC |
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| Outlook Mac |
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- Green = Delegate can Send on Behalf, Send As
- Red = Delegate cannot Send on Behalf, Send As
3. Delegate Permissions (Calendar and Respond to Invitations on Behalf of)
Granting a user "delegate" permissions will allow them to view and edit your calendar, and respond to invitations on your behalf.
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Owner: M365
Delegate: M365 |
Owner: M365
Delegate: On-Prem |
Owner: On-Prem
Delegate: M365 |
| OWA |
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See note below. |
See note below. |
| Outlook PC |
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| Outlook Mac |
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- Note: Can view but not edit calendar. Cannot act as a delegate and accept/decline meetings on behalf.
- Green = Can view pending appointments and edit calendar. Can accept/decline meetings on behalf
- Red = Cannot view or edit calendar. Cannot accept/decline meetings on behalf.
4. Calendar Sharing
Calendar sharing refers to granting the recipient access your calendar with Editor permissions. Delegate permissions are covered in the above section.
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Owner: M365
Recipient: M365 |
Owner: M365
Recipient: On-Prem |
Owner: On-Prem
Recipient: M365 |
| OWA |
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| Outlook PC |
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| Outlook Mac |
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- Green = Can view and edit calendar
- Red = Can view but not edit calendar
5. Folder Permissions
Folder permissions are not supported between On-Premise and M365 mailboxes.