Logged In: YES
user_id=225877

Issue is not specific to MacOS 9. You can reproduce it in
MacOS X too.

SquirrelMail 1.5.1 uses cookies with extra options and
Internet Explorer for Mac adds semicolor to cookie path.

Code is disabled in 1.5.2cvs. I don't recommend upgrading to
1.5.2cvs, because we have other experimental code introduced
there.