Apple has just emailed participants of its Messenger for Mac beta program — this allowed you to install Messages on OS X Lion — to inform them that it ends on Friday, December 14th. Apple notes that users who wish to continue using Messages for Mac should upgrade to OS X Mountain Lion to use the publicly released edition of the program. Messages for Mac allows you to send messages to other Mac, iPhone, iPad and iPod touch devices via iMessage. The full email reads as follows:
The Messages Beta program for Lion will end on Friday, December 14, 2012. We hope you’ve enjoyed the opportunity to preview Messages.
If you’d like to continue using Messages, upgrade to OS X Mountain Lion from the Mac App Store. Messages is one of many great new apps and features built right into OS X Mountain Lion. Learn More.
Thank you for your participation in the Messages Beta program.