On October 24th, 2002 Microsoft released a new version of MSN Explorer. As a user of ChoiceMail version 1.4 using MSN for email you should NOT upgrade to the new version of MSN Explorer. In the new version Microsoft has removed its support of the POP3 protocol. In taking this action Microsoft is preventing ChoiceMail and other 3rd party software products from interacting with MSN email capabilities. If you upgrade to the new MSN version you will NOT be able to use ChoiceMail to block spam.

On December 23rd, 2002, we released ChoiceMail 1.5 which has complete support for MSN as well as Hotmail, Yahoo and AOL.

See also this information from Microsoft