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What do I need to offer hosted Exchange service?

Hi,

Just wondering what kind of licenses for Windows I need to offer hosted exchange service? I have 4 or 5 customers with about 10-20 users each which asked me to move their email from in-house Exchange to hosted solution. I need to know what kind of licenses (CALs) I need to purchase for this if I put my own server(s) in data center and host Exchange for them. What version of Windows it should be? Standard, Enterprise? How many CALs should I buy for, say, 100 users? Are they different CALs for Exchange and Windows Server? Please, give me some ideas is it good idea to offer such a service for 50 or 100 users or it's better to go with Google Apps or resell hosted Exchange solution from another company. I'm trying to calculate the cost of hardware+software to see how much I have to spend for 50-70 users setup. Thanks.
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Michael Worsham
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You may aslo want to investigate SPLA licensing.
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Still can't understand what kind of licenses I would need for 100 users and, say, Windows 2003 server Standard with Exchange 2003 (because I already have them).
Have you read the site about hosted Exchange?
Conventional licensing is not applicable to hosted Exchange solutions. You have to use the licensing programme that Microsoft have for hosters.

Exchange 2007 is the preferred solution for hosted Exchange now, I believe Exchange 2003 is already going towards a best effort basis.

Simon.