GAL sync on a budget - Thanks Quest and Tony Murray
I was very dismayed to find that Microsoft has discontinued support for the old Identity Integration Feature Pack (IIFP) tool that was a subset of their Microsoft Identity Integration Server. This tool was "free" and allowed you to do a reasonably easy directory sync between 2 Active Directory forests (User -> Mail-enabled Contact.) I say "reasonably easy" because compared to a full blown install of MIIS, it was easier but still not simple.
The folks at Quest have once again recognized a hole in the market and have provided a free tool. Active Directory MVP Tony Murray has written a couple of good articles on using this tool. See: