What will happen when my Forum service reaches the message limit?

If you have the Free Forum, when you reach 1000 messages you would either need to upgrade your service, or manually delete old posts to free up space.

With the Professional Forum, when you have the 10,000 or 100,000 post packages and reach the limit you either need to upgrade to the next level, or manually delete old posts to free up space. When you reach the highest Pro level limit of 200,000 posts it will automatically delete the oldest post, making room for new ones.