According to the deployment guide:

Before you install Exchange Server 2003, ensure that your network and
servers meet the following system-wide requirements:
�       Domain controllers are running Windows 2000 Server Service Pack 3 (SP3)
or Windows Server 2003.
�       Global catalog servers are running Windows 2000 SP3 or Windows Server
2003. It is recommended that you have a global catalog server in every
domain where you plan to install Exchange 2003.
�       Domain Name System (DNS) and Windows Internet Name Service (WINS) are
configured correctly in your Windows site.
�       Servers are running Windows 2000 SP3 or Windows Server 2003 Active
Directory.

So there is no requirement for AD to be hosted on a Win2003 box.  The
requirement to install Exchange 2003 first on a particular box is because
Exchange 2000 does not work with IIS 6.0.

-Steve

> The real reason is that 2003 AD Schema is very different than 2000, so
> this should be the upgrade path.
> Upgrade Windows 2000 to 2003, then upgrade E2K to E3K, but I would be
> scared to do this.
> 
> Eric
> 
> 
> -----Original Message-----
> From: Bob Sadler [mailto:[EMAIL PROTECTED]
> Sent: Tuesday, August 05, 2003 8:59 AM
> To: Exchange Discussions
> Subject: RE: Running Exchange 2000 on Windows 2003
> 
> 
> What?  I thought it was the other way around?
> 
> OK, for those in the know, please clear this up.  You upgrade Exchange
> first, then OS?  Or OS first, then Exchange?
> 
> 
> 
> Bob Sadler
> City of Leawood, KS, USA
> WAN/Internet Specialist
> 913-339-6700 x194
> 
> Get a Life!  Get TWO!  Play Second Life!
> http://secondlife.com/ss/?u=3Db4ebbfdd6af98a027fa7e89a86c55a68=20
> 
> 
> -----Original Message-----
> From: Steve [mailto:[EMAIL PROTECTED]
> Sent: Tuesday, August 05, 2003 10:58 AM
> To: Exchange Discussions
> Subject: Re: Running Exchange 2000 on Windows 2003
> 
> 
> I do not believe you can install Exchange 2000 on Windows 2003.  Windows
> 2003 runs IIS 6.0, which Exchange 2000 does not support.  On the other
> hand Exchange 2003 can run on IIS 5.0.  So the proper upgrade path is
> upgrade Exchange 2000 first and then upgrade the OS to Windows 2003.
> 
> Thanks,
> 
> Steve
> 
> 
> > Are there any restrictions on running Exchange 2000 on a Windows 2003
> > platform?
> >=20
> >=20
> > Ron Pennell
> > [EMAIL PROTECTED]
> 
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