rogeepete wrote:
Is it possible for me to create a new identity duplicating that of a friend?
I have his permission to do this and know his email name and password. I
would like to be able to read his mail as well as mine.

I realize there may be security issues involved.

If you only need to *read* his mail (i.e. not reply, archive, etc.),
then the answer is in your subject line, i.e. you just need an extra
Mail *Account* (Tools - Accounts... - Mail - Add- Mail... - ...),
not an extra *Identity*.

See also Ron's response about "Leave a copy of messages on the
server".