We were able to release this feature to the community this morning.
You can sort the messages in the board view by the date the thread was started or by the date of the most recent post to the thread. The default is to sort it by the most recent post to the thread so that messages with new activity are at the top of the list.
To change the sort order for your account, login to your profile and click on the preferences tab. Make any changes you would like and be sure to click Save Changes.
Thanks!
Molly K.
Web Support & Operations Manager
National Instruments