Which of those Microsoft services are the best? We've tried them all, and we've selected five free hidden gems.

You'll notice that most of these services carry Microsoft's "Live" brand. If you're like most people, you're probably thoroughly confused by the Live lineup, and by what Live actually means--especially since Microsoft has muddied the waters with the newer "Live Essentials" moniker. For the record, Windows Live is a central online location for accessing the Live services and applications. Windows Live Essentials is a subset of the Windows Live brand that houses downloadable applications, including Photo Gallery, Movie Maker, Messenger, and others.

Windows Live SkyDrive

How's this for a deal: Get 25GB of online storage, at no cost, with no strings attached. That's what Windows Live SkyDrive offers. Just create folders on the site and upload files to it. You can share any of your folders with colleagues, as well. The site's design is simple and straightforward.

That isn't to say SkyDrive is flawless. You can't use it as a virtual drive--it won't appear on your PC as a drive, so you can't save files directly to it within a program like Microsoft Word. That's a minor point, though. You can't argue with 25GB of free storage, especially considering that neither Google nor Yahoo currently has this kind of service. While Google is rumored to be working on a similar service called GDrive, Yahoo's Briefcase provides only 25MB of space, and is shutting down at the end of March anyway. So right now Windows Live SkyDrive is as good as online storage gets.

Windows Live Sync

If you have more than one PC and you want to keep files and folders on them synchronized, you need this service. After you download and run a small piece of software on each PC, head to the Windows Live Sync Web site and tell it which folders on which PCs should stay in sync.

You can synchronize your personal folders as well as your shared ones. Whenever any of your PCs are connected to the Internet, they will automatically sync the specified folders with one another. In addition, you can connect to any synced computer from any other computer to browse through the remote system's entire hard disk and to download files.