PM space?
 

Many members asked us to increase inbox limit, it's currently set to 100. We discussed it, and decided that increasing the limit is an "unnecessary bloat" to the database.

If, for any reason, you want to save a PM or several, just use the "Download Private Messages" feature found in Inbox page:

http://i29.tinypic.com/2en71h1.png

This way you'll have all your important messages saved in your local machine.