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Thanks for your suggession in advance
What technical approach do you use?
One way I like to do this kind of "sniffing" is to stand the normal logic on its head -- that is, serve the IE page as the default, but sniff for specific other browsers and redirect them to an IE-only message. This approach may miss a very few user agents, but it has the advantage of letting the search engine bots crawl unobstructed.
Of course the ideal is to be cross-browser compatible. But I do understand that some sites make intensive use of IE-only functionality for various reasons.