Can I install an Exchange 2003 server into a native Exchange 2007 environment? If possible, what are the cons?

Not possible as exchange 2007 is already in native mode. Probably with mixed mode, it was possible.Raj

From technet: If you deploy Exchange 2007 as a new organization, you cannot later install Exchange 2003 or Exchange 2000 in the Exchange 2007 organization. This is not a supported scenario. If you anticipate requiring Exchange 2003 functionality in your organization in the future, you must first install an Exchange 2003 organization and maintain at least one Exchange 2003 server. Planning for Coexistence http://technet.microsoft.com/en-us/library/aa998186.aspx

Hello,Ifyou have an Exchange 2003 server in the site before installing Exchange 2007,then you cannot install Exchange 2003 in to an Exchange 2007 domain.In that case you are going tobuild a new forest, put Exchange 2003 in to it, export the content to mailboxes on Exchange 2003 and then export them out again to be imported in to the Exchange 2007 domain. There is no otherways, in my experience.regards from www.windowsadmin.infoManuPhilip

hi quick question i have an exchange 2000/2003 and i prepare the enviroment to install exchange 2007 with the followin commands setup /preparelegacyexhanceperismiosion setup /prepareschema setup /preparead but i never run the installation of exchange 2007 can i install an exchange 2003 server on the same domain? or the commands i run before prevent me to do so? thanks