troubleshooting Question

Upgrade Exchnage 2000 to 2003 in Mixed Mode AD Environment

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I would like to upgrade our Exchange 2000 server  to Exchnage 2003.  We are currently a 2000 AD Mixed Mode environment that includes one NT4 BDC.  In order to upgrade to Exchange 2003, will I need to also upgrade my BDC to 2000 SP3+?  There are specialized apps on the server so it cannot be upgraded.  I have read some articles that say it will work while others say that all domain controllers and Global Catalog server must be 2000 SP3+.  Any help on this would be appreciated.

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