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Prior to the most recent Google update, we noticed our microsites were indexing very well.  The intent of these microsites was not to build link popularity for the primary sites, but simply to show up as additional results within search. However, with the most recent Google update, we see the microsites are not indexing very well.  And given the suggestion from Google that microsites should be avoided -- with the potential that the primary site be penalized if they are not -- it appears those microsites should be pulled down. But on Bing/Yahoo, these microsites are still indexed -- and indexed very well. So this begs the question: are microsites worthwhile?  Do we think Bing/Yahoo will follow suit?  Is it beneficial to perhaps tell Googlebot to ignore the microsites while allowing Bing & Yahoo to index them?  Looking for some thoughts here...