Install Exchange 2007 into Exchange 2010 Organisation

Hi Guys

I know there is a lot of Threads on this that say you cannot do it if the last Exchange 2007 has been removed but I found this note on one of the technet articles:

It's supported to install Exchange 2007 servers into an Exchange organization where the schema was extended using Exchange 2010 SP1 bits.

http://social.technet.microsoft.com/wiki/contents/articles/880.deploying-exchange-legacy-servers-into-an-exchange-2010-organization.aspx

Does this mean I can install an Exchange 2007 server? 

Reason is I'm being forced to do this even if its not a supported scenario.