I'm looking to build a voicmail system for a small business. Currently we have 2 analog phone lines, but will expand to 4 in the next few weeks. I'm looking for a simple "automated attendant" type setup that will answer calls, forward message alerts via email, etc. This will be running on a standard Windows box (XP Pro or Server 2003, whichever will work best). I need suggestions for the best telephony boards to consider, as well as suggestions for suggestions for software.