We have Exchange 2007 installed currently (SP3, latest UR). I installed Exchange 2013 in preparation for migration, started working on configuration. After doing some digging, we realized we don't have any licensing for 2013 (miscommunication). The obvious solution is to purchase licensing for 2013, but the cost is an issue.
First questions: we do have licensing for 2010. Is there any way we can install Exchange 2010? Everything I'm reading says no, but would like confirmation. 2010 was never installed in the environment.
Second question: If I cannot install 2010, can I install a second 2007 server after 2013 has been installed (newer OS)? Safely uninstall 2013?
Thanks!