Indexed Pages Question
 

I use a tool to check how many pages are indexed in Google, Yahoo and MSN. It changes a little every few weeks but an upward trend overall. Today Yahoo has ZERO pages indexed. This happened back in late March/early April and rebounded a day or two later. What would cause this?

Maybe they were updating their servers at the time you checked them. Who knows...

Yes, lowry is right... All SEs nowadays are keep on updating that's why the index pages count vary from time to time... They are maintaining their sites..:D