When I look at my Outlook folder list on the left, I see most of my mailboxes are named after the email addresses that they receive emails for. I also have a pst-file that is called “My Outlook Data File”.

These names are quite long and thus get truncated unless I widen the Folder Pane. Especially since some of my mailboxes only differ in the domain part, I prefer to shorten or otherwise customize these mailbox names.

How can I change the names for my mailboxes and pst-file?