Microsoft is minutes away from officially launching Windows 8, it's most radical change to the operating system since Windows 95.
The event is being streamed live on Microsoft's website at a slightly later than planned 8:15 PDT, which translates into 16:15 BST. So you can see for yourself what the new OS will and won't do.
Launching alongside the new software is Microsoft Surface RT and Microsoft Surface Pro, the company's first in-house built tablet/laptop devices.
We'll be reporting on everything that's announced so if you don't want to watch you can check back here later for everything you need to know.