>>As for your request, you will have that in the next version of the Universal Thread Navigator which will offer an interface to the Universal Thread CD based on an annual subscription.
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>I can already do that while online by using the search function and select the entire year, for example, as a source range. It is just that I can't do if from work. Secondly, will there be any guarantee that the archived messages will be available for the forseeable future (say the next three years)?

We keep all the data. This is one of the goal of the Universal Thread.

The new feature will be more than a search. It will offer someone to get all the UT data locally on a regular base for various purposes.