Historically, DirectAccess was implemented in Windows 7 as a client, but even then, it was perceived to be the type of service an organization would most benefit from, and therefore it was only enabled on the two high-end editions of Windows 7 – the Ultimate edition, and the Enterprise edition. It was also implemented in Windows 2008 R2 Server, acting as a client. Truly, not many users install this operating system on their laptops and lug it around all day, but for those who do, it's there.
So far, Microsoft has elected to support DirectAccess only on the previously mentioned platforms, and it doesn't provide a solution for non-Microsoft operating systems either. There has been some confusion in the market surrounding certain software called SecureDirect by Centrify that provides integration of Linux into DirectAccess, but it's actually only integrating backend Linux and Unix servers and does not allow Linux or Unix clients to connect to DirectAccess.
With the release of...