I would recommend you update Exchange first. There are many people running Exchange in the environment you describe, but it's outside of the Exchange 2003 support perimeter. And as of April 8, that support is gone too. I wouldn't personally want to stretch my luck but so far.
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Phil Hershey Sent: Sunday, February 9, 2014 2:38 PM To: [email protected] Subject: RE: [NTSysADM] RE: AD 2003 -> 2008 Transition Thanks, Michael. Also relevant, and put me in the direction of this one: http://support.microsoft.com/kb/942564 Any idea how the upgrade will effect our Exchange 2003 systems? We're still 60 days from our 2010 upgrade. (Yes I know. You won't remember, but we talked about the Ex2010 migration a couple of years ago. Finally getting off the dime now.) - Philip This communication, including attachments, is for the exclusive use of addressee and may contain proprietary, confidential and/or privileged information. If you are not the intended recipient, any use, copying, disclosure, dissemination or distribution is strictly prohibited. If you are not the intended recipient, please notify the sender immediately by return e-mail, delete this communication and destroy all copies. -----Original Message----- From: [email protected] on behalf of Michael B. Smith Sent: Sun 2/9/2014 9:00 AM To: [email protected] Subject: [NTSysADM] RE: AD 2003 -> 2008 Transition Is this what you are referring to? http://technet.microsoft.com/en-us/library/dd566199(v=ws.10).aspx From: [email protected] [mailto:[email protected]] On Behalf Of Phil Hershey Sent: Sunday, February 9, 2014 11:00 AM To: [email protected] Subject: [NTSysADM] AD 2003 -> 2008 Transition Have a number of 2003 DCs in a 2003 Native Mode forest. We've finally committed to upgrading to 2008 R2. Done the schema extensions, but I have a concern about the issue raised in a KB that I now cannot track down about the NT4-mode authentication no longer functioning. We haven't had an NT4 box in years, but we do have a number of older NAS systems (Buffalo units) and old applications. My question has to do with when this loss of functionality occurs. Is it when the first 2008 R2 DC is promoted into the 2003 functional level domain, or is it actually when the forest functional level is first elevated to 2008 R2 (which makes the most sense to me). Thanks in advance. - Philip This communication, including attachments, is for the exclusive use of addressee and may contain proprietary, confidential and/or privileged information. If you are not the intended recipient, any use, copying, disclosure, dissemination or distribution is strictly prohibited. If you are not the intended recipient, please notify the sender immediately by return e-mail, delete this communication and destroy all copies.

