Thanks for your question,
We are cleaning up alot of older threads and locking them. Some of the reasons we lock threads are:
Irrelevant or out of date (ie older version, functionality etc)
Question has been answered
Members are still posting to it after there was a correct answer
Members are actually asking new questions which should have a separate thread
Let me know if you have additional questions or details around a specific thread.
Best Regards, Sara