(What software is being used with regard to encryption and security?)
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Sorry but "We are currently using a version of PPTPd that was optimized for performance." What do you mean by performance. There is no such thing with PPTP. PPTP is just not that configurable. That is super that you can throw out a bunch of buzz words.
I would not trust PPTP when it passes the user name in the clear. I would include a link for more documentation but I have not posted enough yet. I would only trust OpenVN or IPSec or VPN types that are just as strong.