Free accounts do not offer Pop3 and therefore will not be able to be checked via any external email checker
I'm using a small app called 'ePrompter' which, when minimised, resides in the system tray.
I use it to check Hotmail, Gmail, and my home [pop3] accounts. I can delete spam/crap at server level with it, so it never reaches my machine.
It supports Yahoo, Hotmail, Gmail, POP3, AIM, Windows Live Mail, AOL, Earthlink, Excite, ... etc. etc. etc... there's dozens of different types of accounts it supports. [Nearly all well-known ones]
No, It's not DesktopX ...but I thought you might want to know there's at least something that will work. I find it to be a very handy little app. Support and help for it at their site is also very good.
Oh, ...and it's free from http://www.eprompter.com and contains no spyware/malware.