Windows 7 may be Microsoft's biggest public beta to date, but today they've launched the public beta of their next Exchange Server software. I somehow doubt it'll do the same kind of numbers as Windows 7...According to Microsoft, Exchange Server 2010, as part of the next range of Office products, is "designed to give people a consistent experience across devices, making it easier to create and edit documents and collaborate from any location".
The full version is likely to launch towards the end of the year, with the rest of the Office 2010 suite coming in the first half of next year. All in all, it looks like a pretty big year for MS, dont you think.
You can download the Exchange Server public beta by clicking the link below.