Funtick - 7:41 pm on Aug 28, 2008 (gmt 0)

If Googlebot has scheduled to refresh 36000 pages from your site today, and your site is down during 10 hours, - all it will get is "IO Error" and all 36000 pages will disappear... if your site is huge (1000000 pages) 10-hour breakage will remove only 36000 pages from index... it's very natural for any kind of search engine...