Exchange 16GB limit reached.

I have a customr who has just reached the 16gb limit on the size of the priv1.edb. I have done a defrag, etc, and am out of the woods for a month or two. My question is; If I create a second Storage Group in the System Manager, will I get another 16GB after I move the biggest hogs into the new Storage Group, or is 16GB the magic number for a server?