Hello Brendan,
thank you very much for your interest in our solutions.
We officially support version 6 and 7 but we can support version 5 understanding that some of the integration points are not available in the older version. Having said that, it would still deliver a great program that would be deeply integrated and full-featured in relation to what version 5 is capable of delivering.
If you have further questions, please don't hesitate to contact me or Brennan Kirby.
Thank you,
Markus