Switching Identy option no longer appears under "file" Why not?

[October]

Before I installed Microsoft Office, I used to switch easily between 2 email
accounts. I just clicked on "file" and then clicked on "switch identity."
Now...that option is gone. Where is it? Thanks.

 

[DL]

OL and OE are two completely different progs.
OL doesnt use identities, OE does