1. Sign into your account on Outlook Web App (OWA).
2. Right-click on the root folder (your name) and select Permissions.
3. Click on the + icon on the top left hand corner to add a user.
4. On the Add permissions window, enter the name or email address of the person you want to give permissions to and once the user has been selected, click Add.
5. Select the permission level from the predefined settings from the drop-down menu and click OK once you have selected the relevant permissions.
6. To give permissions to a particular folder, right-click on the folder and select Permissions. Then follow steps 2-6 above.
The user that has been given access will now need to add this to their OWA account, they will need to follow the steps below:
1. Sign into your account on OWA.
2. Right-click on the root folder (your name) and select Add shared folder.
3. On the Add shared folder window, enter the name or email address of the user who has shared folders with you and click Add.
You should now be able to view this folder on the left-hand side of the navigation panel.