Nokia made a stupid decision by ditching its own platform MeeGo and QT. Understandable its a past, things cannot be reverted back. In fact Windows 8 is a good OS platform.

But Nokia doesn't realize that it is dependent on Microsoft. Windows 7.X has limited hardware support, because of which Nokia could'nt develop high end devices supporting Multi Core and HD resolution (untill windows showed up). Microsoft even ditched nokia by not letting its existing high end device enjoy the flovor of Windows 8. All history.

1) Nokia keep Windows as its mobile OS.

2) But just like Sansung is into multiple OS (Bada a failure, Android and Windows a hit), why doesn't Nokia bring back its MeeGo and QT back into a team and launch Devices with multiple OS in order to bring varieties? (for instance they can use some Lumia Windows handset, create one vairation in which they have same hardware configuration but MeeGo and for low end devices use Symbian) that way it will be much benificial / profitable for Nokia. When the Nokia created a tie up with Microsoft, I don't think Microsoft came up with any term in which Nokia is not supposed to use any other OS,

3) Nokia can use Lumia to compete with Samsung Omin series in windows race (and Nokia will turn out to be a clear winner). They can use MeeGo devices to compete with Samsung Android devices and Symbion to compete with Bada devices.