lucy24 - 2:35 am on Nov 22, 2012 (gmt 0)
On some level they must know the difference, because they really do stop crawling after a while.
:: quick glance to see what forum we're in ::
Bing otoh doesn't seem to care. I've got pages that have been 410'd for ages but they still come by regularly. Not as often as for active pages, but still several times a month for pages that rarely changed when they were active.