One can say there was no need for a confirmation, since Windows 7 barely has the base for running Modern UI apps, but the company has settled that Spartan will not be offered to users of this OS.

Not now, not never.

It does in some way make things a little bit more difficult for the new browsers, considering the fact that its immediate competitors like Chrome and Firefox, even Opera are available on multiple platforms, and multiple versions of various operating systems.

Then again, this limited availability on Windows 10 will only impact its early adoption — if Spartan is good enough, users will come to it.

And besides, as the IE development team [Only registered and activated users can see links. ], users already have a free upgrade path to Windows 10 if they so desire:
[Only registered and activated users can see links. ] [Only registered and activated users can see links. ] No current plans for Spartan on Win7. Win7 users will be able to upgrade to Win10 for free as you probably know
— IE Dev Chat (@IEDevChat) [Only registered and activated users can see links. ]
The company also confirmed that currently there are no plans to launch Spartan on rival platforms.

Microsoft wants everyone to switch to its new operating system, and the company obviously plans to first get Spartan right on Windows 10 before thinking about porting it to other platforms, desktop, mobile and what not.

Still, there is little to no chance of the app coming to Windows 7.

And that’s the takeaway here.