exchange 2007 and xp clients using outlook in nt4 domain

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Current Environment - Windows 2003 Forest & Domain Functional Level and Exchange 2003
Still one or two customers on NT4 Domains connected via Trust Relationship to above environment.

XP clients in NT4 Domain use Outlook 2003 to connect to Exchange 2003 organistation.

We plan to introduce additional Exchange servers probably Exchange 2007 servers co-existing with Exchange 2003.

My question is: Will the XP clients in the NT4 Domain still be able to retrieve email after the schema upgrade that will allow us to introduce Exchange 2007 servers and if so can the mailboxes for NT4 users be hosted on the Exchange 2007 servers or will these have to be on the Exchnage 2003 servers?

Thanks for any advice in advance

P.S. I know we should be decommissioning the (unsupported NT4 domain) and this will be the case soon however there is a need to introduce additional Exchange servers first


Is NT4 domain in the different forest, and using linked mailbox on the exchange server? Per my research, there"s no indication that mail flow will fail after introducing exchange 2007 into the organization

Yet, to host mailboxes for NT4 users on an exchange 2007 server isn"t a recommended solution. In this configuration, version of LSASS.EXE used on NT4 DC would cause performance issues on the Exchange 2007 server. It could also create issues that have not been tested or planned for, and would be difficult to troubleshoot

And, please make sure that all requirements have been met before you install the exchange 2007 server

Exchange 2007 System Requirements

James Luo

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