MS CAL Licsensing help - Windows 2000 Server network now adding Window Server 2003 to the mix.

I need help understanding some licensing issues.

I have 4 servers,  all running Windows Server 2000 (OEM Version).  I have a Total of 48 workstations, of which all are running Windows 2000 Pro (OEM Version).   The network has 4 sites.   Site 1:  1-server & 28-workstations, Site 2: 1-server & 9 w.s., Site 3: 1-server &4 w.s., Site 4: 1-server & 7 w.s.  The current license set up is "Per Seat".  My understanding is that any workstation can connect to any server this way.  Now here is what licenses we have:  5 licenses each with each server thus total of 20,  and 7 certificates that each have 5 additional licenses, thus a total of 35.  A grand total of 55.  RIGHT ?  Everythings Good.

Now since that time there have been additions to the network.  At Site 1: a Windows 2003 Server (OEM Version) and 4 additional XP-Pro workstations,  Site 2: 1-XP w.s., Site 3: 1-XP w.s., Site 4: 1-XP w.s.  Bring my totals to 5 Servers & 55 Workstations.  With the additions the same "per seat" set up.  My question is since I now have the Windows Server 2003 on the network do I need to get the 2003 licenses?  or can I just add the number of client license I need for the extra clients?   Also with the old total of 55 and the new 2003 Server (OEM) does this take my correct total to = 60?

I guess I'm confused between the Windows 2000 Server Licesnse and Windows Server 2003.  And if I would upgrade all my workstations to XP-PRO could I use the old licenses?   What about upgrade to the 4 older server to 2003?  

Just what is the correct mix?   - - Should have also got "Open" Licenses. also !!!



rahowell2Asked:
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Dean ChafeeIT/InfoSec ManagerCommented:
Oh yes... Microsoft Licensing. What a confusing mess. I personnaly find it very confusing and I have been doing it for a long time. I don't claim to be an expert in this are, but I can tell you this:
There is NO upgrade path from any OEM version. Server or workstation, W2k or XP. The only way to upgrade them is from a full version, box copy or volume license. You save some money up front with OEM licensing, but they get you later!  The CALs are different, as I understand... you simply have to keep proof of purchase and you can transfer them to the upgraded server. I Hope this helps.
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rahowell2Author Commented:
Microsoft Licensing !!! - Must have scared everyone off.   No good answers yet ????  I guess I might have to Bill G.  Since this is his baby.
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