Minuet requires MDS (which requires BES.) For non-enterprise users, there are workarounds. Please review Mark Rejhorn's FAQ
http://www.blackberryforums.com/blackberry-network/2185-blackberry-internet-msn-chat-web-telnet-tcpip-no-bes.html) for workarounds specific to your service provider.
Thank you for your interests in Minuet!