Help to choose right version of BES, Exchange and PGP support

Hello, all.

I want to host own BES server (for me, my employers and friends).
I read so much about that in last few months, and finally decide to do it.
I need your help to choose right version of BES server, Exchange Server and how to implement PGP support. PGP support is MUST HAVE, bcoz I want write to friends and peoples who have PGP devices from some other 'networks'.

So, I read so much about BES 5 and BES 12.
Wich one you suggest me? And why?
Is possible to implement PGP support?
What I need? As I told, I read so much, but all threads are old and many things are changed now. For example, PGP universal server don't exist anymore. So, is there any other solutions?

All informations are neccesary and helpful for me.
Thank you in advance.
Regards.

@ admins & mods

Please, move this thread in right section, here nobody don't answer. :)