We are planning to transition to a new 2008 R2, Exchange 2010. Unforunetely I can not upgrade the AD to the minimum requirement of 2003 native due to the a 2000 server as one of the DC. This 2000 server also is the exchange server 2003. So, i need to get rid of the server 2000 so I can get the AD to 2003 or better for the exchange 2010 implementation.
Can you upgrade the OS of an exchange server / DC from server 2000 to 2003? Will this break the AD or Exchange?