Mailbox size

First, you should check your Outlook Today folder to see where the space is being used. Do this by right-clicking the Outlook Today icon, and selecting Properties, shown below.

Click on Folder Size to see a breakdown of where your space is being used.

Once you know where the space is being used, add an entry to Outlook so you may sort by message size. Do this by right-clicking on the “from” field, and selecting SIZE. Put it on the tool bar by clicking and dragging it there. You may now sort the mailbox by document size, and identify documents that may be very large.