since switching to a smartphone, I've kept all of my text messages in the inbox and sent box. I hope a feature would come out that would enable me to automatically "Move" all sent and inbox messages older than the defined date into an Archive folder in my computer.
For example i choose Jan 1, 2013 then click on Archive. All Inbox and Sent messages before Jan 1, 2013 will get moved to the Storage folder in my computer.