The next two years will be crucial for software giant Microsoft: Under attack on numerous fronts, it could falter - or it could fight back to become even more dominant.

"Microsoft is in its most vulnerable moment in history, just like IBM in the 1990s," says George Colony, the chief executive of technology research firm Forrester.

Vulnerable? The company whose software powers more than 90% of all the world's personal computers?

BBC NEWS | Business | The assault on software giant Microsoft