(* Source: Erik Schonfeld *) 

Ray Ozzie first hinted at it during a keynote speech last March. But tonight Microsoft is finally launching a preview beta of Live Mesh, a new Windows Live platform for syncing files and, eventually, applications across different devices. (Of course, for Microsoft, a beta means 10,000 people, so you have a pretty good chance of getting in if you sign up now—or not). Mesh is really a key element in chief software architect Ozzie’s efforts to make the Web the center of the Microsoft experience for consumers instead of the PC.

Mesh lets you set up a virtual desktop online, and connect different computers to it. Put any file into a Mesh folder and it automatically syncs between the online desktop and every connected computer. Select a file or folder and you can easily share its contents—photos, videos, music, documents—with any friend or family member. You can also remotely control a connected computer from the Live Mesh desktop. Right now, this works with any computer, as long as it is running Windows XP or Vista. But the longer-term vision is to truly make this work with any device. Mac and mobile versions are coming later this year. And eventually, anything from Xboxes and DVRs to digital picture frames and printers could be connected through Mesh.

A hundred of Ozzie’s engineers have been working on Mesh for the past two years. At launch, it may not seem like much more than a combination of Windows Live SkyDrive and FolderShare, but under the hood it is an ambitious platform play. Mesh is really aimed at developers. Not only does it provide a framework for syncing files between devices, it can also sync applications. The way it does this is by using a two-way RSS or Atom feed developed by Ozzie called FeedSync, formerly called Simple Sharing Extensions.

The basic foundation of Mesh is this feed-centric programming model. A Web developer can build an app using any programming language or tools he likes (Python, Ruby on Rails, Flex) and then sync it across devices and other applications using two-way feeds as the basic data and communication channel. The promise for developers, says product unit manager Abhay Parasnis: “If you Mesh-enable your application, we will let you extend it to other devices.”

Microsoft is offering a set of Mesh APIs that include storage services, membership, sync, peer-to-peer communication, and a Newsfeed feature that tells users the status of different folders and who’s accessed them. The same programming model works whether a developer is building an app for an offline device or for the Web

In many ways this effort is a counterweight to what we are seeing with Adobe Air or Google Gears, which are efforts to take browser-based apps offline. With Mesh, Microsoft is in effect reasserting the primacy of client-based applications. They need not be Windows-based, but I’m sure that won’t hurt. Developers can customize their apps for whatever device they originally reside on—whether it is a PC, a smartphone, or a set-top box—and then Webify them by syncing them to other applications across the Web. These apps could be more powerful than apps confined to a browser-like sandbox without giving up the connectivity of the Web.

One example given to me was a PC-based genealogy app that would update whenever a family member made a change on their computer. The problem with this example, and perhaps the problem with Mesh, is that there is already a solution to that synchronization problem. It is called Geni, and it is a Web app. What I’d like to see, though, is a Mesh version of Word or Excel. That could at least begin to answer the threat presented by Google Docs and other online productivity apps. Mesh makes ciient apps social by linking them together and to the people you know.

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