You can't use the SSTP VPN protocol for Mac, Windows XP, iPhone, iPad, iTouch, or Android.
Despite hundreds of rumors being spread on the Internet, SSTP is only supported by Windows Server 2008, Windows Vista Service Pack 1 (or later), and Windows 7.
SSTP is only supported by Windows Server 2008, Windows Vista Service Pack 1, and Windows 7.
There is no way around it.
So what are your options?
Mobile devices – PPTP or L2TP/IPSec
Mac/Windows/Linux – SSL/OpenVPN (PPTP and L2TP also available, but less preferable)
Win. Server 2008/Win. Vista SP1+/Win 7 – Yes, SSTP is available.
A definite need for an SSTP client for Macs and iPads. It gets around the issue of a firewall if PPTP or L2TP outbound ports are blocked. Really the only way around that right now is SSTP. Pretty simple (though I couldn't do it. ) It is just using the SSL transport (port 443). Wondering why MS has a corner on that market to date? Works great from Win7 or Vista, I'd just prefer not to have to use one of those options...