How do you compete with free? That's the question Steve Ballmer, Microsoft's CEO, is trying to answer every morning when he goes to work. On the server software side, Windows Server is doing well, especially with the Exchange e-mail server and the unheralded but very good collaboration server, SharePoint. These products have matured, they're relatively easy to set up and manage by IT organizations. The Exchange component is a spectacular success: it manages e-mail, contacts, calendars for hundreds of thousands of organizations all over the world. Even Apple finally embraced Exchange: the iPhone now syncs well with Microsoft's server and the next version of OS X promises "native" Exchange support. In plainer English: Apple's Mail, Address Book and iCal programs, for example, will sync with Exchange "out-of-the-box" just like the iPhone does. (This will be a relief to suffering Entourage users. Entourage is Microsoft's own Outlook sibling on the Mac, but it is a poor relative and lacks Windows' Outlook depth and polish.) Seeing that Windows Server generated more than $20 billion last year, one is tempted to think everything is going swimmingly.