I am trying to do a similar thing. Use Hotmail through Mac Mail and can only find the below. Let me know if this works for you - I am yet to try it.
http://www.automagic-software.com/products.php
check your mail->preferences->accounts, and click on your hotmail account.
in the 'account information' tab, i have the following--without the brackets:
description: [what shows up in the account pane to the left]
email address: [your hotmail address]
full name: [um...yer name]
incoming mail server: [hotmail.com]
user name: [your email address before the @]
password: [your hotmail password]
outgoing mail server:[services.msn.com:myusername]
if i click the 'server settings' button below that pulldown, i can type in 'services.msn.com' easily enough. but, in order to get my username to show, i change the authentication pulldown to 'password' and enter my username and password.
ok...that last bit is where it gets a little hinky. mine works just fine with authentication turned off. but, in the main view my outgoing server still shows my username after the colon.
also, make sure you configure the other tabs....especially the 'advanced' tab where you have to enable the account.
and, that the httpmail url is set to:
http://services.msn.com/svcs/hotmail/httpmail.asp