About an hour ago I received an invitation from Microsoft Connect to try out Live Mesh. Having watched the preview videos on Channel 9, I was looking forward to this opportunity for some time, so I immediately downloaded and tried to install it.

About a second later I was greeted with the following: 

Apparently, Live Mesh client requires UAC to be switched on during installation and operation. This is due to a technical constraint imposed by the COM layer in Vista and should be fixed in the next beta release.

There is a post on the Live Mesh Blog that provides some more information.

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