Question : Exchange 2010 on a Domain Controller

I am evaluating Exchange 2010 in my office on a test machine with a local 10.10.x.x IP address, is it OK to make the Win2008 server I plan to install Ex2010 on a Domain Controller so I can have just a single machine running my Exchange 2010 environment? I know it is recommended to not install 2010 on a DC but this is just tetsing?

Answer : Exchange 2010 on a Domain Controller

To be honest most test environments operate in a single server setup, I have 3 Domains all with single Domain Controllers of various different flavours and an installation of Exchange 2003, 2007 & 2010 all of which are on domain controllers.