QuickIM is a powerful instant messenger for your Blackberry 7210, 7230, 7250, 7280, 7290, 7510, 7520, 7730, 7750, 7780, 8700, 8100 Pearl and similar devices (see the requirements and compatible devices section) supporting the public MSN network. It enables you to quickly exchange and send instant messages to other phone and PC users from anywhere without paying any ''per message' charge ! Because it connects directly to the MSN instant messaging server, this solution is a cost saving alternative to most costly data consuming messengers that use proxy technology and that charge you an annual subscription fee.
there is a trial version with a cheaper cost to register the complete version, just to download the program in http://www.quickim.com