Exchange 5.5 & AD question

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From: Sin Joe (SinJoe_at_discussions.microsoft.com)
Date: 11/11/04 

Date: Thu, 11 Nov 2004 10:35:04 -0800

HI,
 I am about to upgrade my two domains to Windows 2000, Account domain A and
Exchange Domain B,Exchange Domain which will become Child Win 2k domain, (
both mixed mode).
My question is DO I NEED TO INSTALL "ADC" for mail and other things work the
same old way.
I will move/migrate to Exchange 2000/2003 after 2 months.

thanks