Messages on Lion until beta ends

MacRumors reports when OS X Mountain Lion is available, Messages will stop working on Lion.

“Thank you for participating in the Messages Beta program. With the inclusion of Messages in OS X Mountain Lion, the Messages Beta program has ended.

To continue using Messages, please visit the Mac App Store and purchase OS X Mountain Lion”

It´s just the way Apple works: Do you want the new update? You´ll have to buy it. No freebies for current user…