The following image displays the different types of permissions available:

Note: The image used above is from Outlook on the web but the same permissions exists for Outlook.

Review Microsoft 365 - Mail and Calendar folder permission levels for definition of each permission level.

In the example below, Bucky is managing permissions to his "Air_Gun" folder.

Add/modify permissions

Remove permissions

Add/modify permissions

Remove permissions

Add/modify permissions

1. Start Outlook.
2. Go to "Mail".
3. Right-Click the mailbox folder you wish to share.

1. Select Sharing Permissions... from the drop-down menu.
2. Ensure you are on the permissions tab.
3. Click the Add User...
4. In the search bar type the users' email address and select their name once it appears.
5. Click the Add button.
6. From within the "Folder Properties" screen, make sure the user is selected and assign folder visible permissions.
7. Click OK when finished.
8. If the folder you are granting permissions to is a sub-folder of another folder, you must grant "Folder visible" permissions to each folder for this user - do this by repeating the steps 3-10 for each sub-folder.
9. Right-Click the desired folder or sub-folder you wish to be shared and choose Sharing Permissions... from the sub-menu.
10. In the Folder Properties > Permissions window:
11. Click Add User...
12. In the search bar type the users' email address and select their name once it appears.
13. From within the "Folder Properties" screen, make sure the user is selected and assign the desired permissions.
14. Click OK when finished.
15. Notify the person you granted permissions so that they now have access to the specific folder.

Remove permissions