- Written for thread based applications, not processes<p>- Asynchronous IO architecture only matched by Solaris<p>- Object based architecture<p>- OO ABI (more so with WinRT), besides the C one<p>- Allows C++ in kernel space<p>- Components as interoperability between applications<p>- User space driver model, specially nice for graphics drivers<p>- Pursues the mainframe ideas of safer languages for system and application&#x27;s programming<p>- Powershell is closer to Xerox PARC REPLs than any UNIX shell,  except for Mac OS X.<p>And what brought me back, after 10 years mostly in UNIX land, culture of using graphic based tools instead of a PDP-11 experience and desire to try new approaches to OS architecture.