I pulled this off a technical support page with AT&T
SUBJECT: Methods to Send and Receive Instant Messages with the RIM BlackBerry Curve 8310
Ways to Instant Message with the RIM BlackBerry Curve 8310
FACT: Windows Live Messenger
RIM BlackBerry Curve 8310
AOL Instant Messenger (AIM)
SYMPTOM: Instant Messaging (IM)
ADVISORY: Standard Instant Messaging charges may apply.
Instant Message (IM) methods supported by AT&T are outlined below. Additional support for any other IM client application must be directed to the product vendor.
There are three methods of sending and receiving Instant Messages on the RIM BlackBerry Curve 8310:
BlackBerry Messenger allows text conversation between BlackBerry users.
This method allows text-only Instant Messages to be sent through the standard MEdia Net and requires a user to log into MEdia Net first.
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