Just to recap
Back in 2006, Valve Software released the trailer for Portal.
Based on that trailer, We Create Stuff created Portal: The Flash Version. The same day they released it, Valve released The Orange Box (Portal being part of it).
The next year, We Create Stuff released the Portal: The Flash Version Map Pack*, which is the levels from Portal: TFV converted to 3D levels in the real Portal.
And then, at E3 a few months later, Microsoft announced “Portal: Still Alive”, which Valve confirmed is Portal plus the Portal: The Flash Version Map Pack.
*I prefer to call it “Portal: The Flash Version: The Portal Version”, but that’s just me.