We have a small (low budget) church. We have two 2003 servers, one runs exchange 2003. Both are DCs. I was finally given the $ for the software upgrades. But, as I have been reading posts I think I cannot do an in-place upgrade to 2012r2 and exchange 2013. There are only about 20 users and the exchange database is about 20gb. The servers are dell 2900 and 2950 with 32gb ram and 2ghz xenon cpus.
With that, any suggestions on how to get this done w/o a new box?