A WebmasterWorld thread has a senior webmaster claiming that in some cases, Microsoft Bing is ignoring the <meta name="robots" content="noarchive"> tag. The noarchive tag basically tells the search engine not to display a "cache" result in the search listings.
This webmaster said it some cases Bing is honoring the tag and in other cases Bing is not. He said there is no rhyme or reason to this, "it's inconsistent, and I don't find this to be true across all the websites I've got those meta tags on," he said. Of course, I don't have an example, being the thread is from WebmasterWorld.
But recently, we have seen many complaints about how Microsoft's Bing handles certain webmaster/search protocols. From not honoring NOODP tag, to not effectively using the meta language tag, to other geo problems and crawling too fast, including clicking on search ads, as well as adding pound signs to URLs - Bing has had its recent share of criticism.
Forum discussion at WebmasterWorld.