You can access popular MSN services on your Blackberry with MSN Mobile. Chat with MSN Messenger or check your Hotmail or Windows Live email accounts right from your browser. Having access to your Hotmail is probably the most useful seeing that you can not integrate your Hotmail account with your Blackberry unless you upgrade to Hotmail Plus. Although not as user friendly as reading and writing emails on your Blackberry it still is a decent alternative if you need to check your Hotmail account. Other MSN services that you can play around with are MSN Spaces, Calender, and Money.
Type in the following URL to access MSN Mobile on your Blackberry: http://mobile.msn.com