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.

Instruction
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.