Open another user’s mailbox in Office 365

In Office 365 you can open anoth­er user’s mail­box. Here’s how.

Go to the out­look web access page. In the left col­umn find your user­name and right click on it.

Right click on your user­name













Then select “Oth­er user’s inbox”

Select other user's inbox
Select oth­er user’s inbox












In the dia­log box that appears, enter the name of the desired mail­box or use the address­book icon to do a full search.

Enter the name of the desired mailbox
Enter the name of the desired mail­box






And click OK. Now you will see the oth­er user’s mail­box appear in the left col­umn.

There's your other user's mailbox
There’s your oth­er user’s mail­box














When you receive an error stat­ing that you have no per­mis­sion to open the inbox when you are sure it exists, you may need to get the right per­mis­sions from your admin­is­tra­tor.

Not found or no permission
Not found or no per­mis­sion






I also have an arti­cle that explains how to set the right per­mis­sions.

Read it here.