If you ask people which products are Microsoft's cash cows, I'd guess that most people would point to Windows and Office. And, they would be right. However, they are not Microsoft's only cash cows. Their server business is a big chunk of their revenue stream too. Microsoft Server, SQL Server, SharePoint and Exchange Server all help Microsoft's bottom line in a big way. Google has been gunning at these markets in the past couple of years without actually saying as much. Take this recent announcement...

Google Apps Connector for BlackBerry Enterprise Server now available

It sounds like a simple middleware for BlackBerry phones in the enterprise environment. But, look at what the BlackBerry connects to: Google Apps email, calendar and contacts. This lets Google drive enterprises away from Microsoft's Exchange Server (and its associated CALs) to Google's equivalent cloud solution.