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I've just noticed that Yahoo (slurp) and MSN (msnbot) haven't updated their database regarding my sites for months. To the contrary, Google updates its database almost once a week as it seems.
I've created subdomains for my sites and they were taken into account by Google very quickly with no problem. Nothing from Yahoo and NSN.
The meta tag "revisit-after" was set to 2 days from the very begining of my sites.
Is there something I'm missing?
Thanks for helping! :)