What KeyStorm does not seem to know, however, is that there are programs you can use to make it look like a POP account to Messenger Plus!, so you can check it.
One of these programs is POP Goes the Gmail. You can find it at
http://jaybe.org/info.htm, where quite a lot of information can be found, and there's also a forum for questions.
Other sites are
http://www.marklyon.org/gmail/ and
http://www.neowin.net/forum/index.php?showtopic=169789.