We have now updated the Historic Index for this month so that it now contains link data all the way from October 2006 through to May 28th 2012.
This release of historic index comes with full complement of Flow Metrics!
The vital statistics as of today are:
Unique pages crawled: 372,709,632,828
Unique URLs: 3,842,466,696,467
Backlinks Date range: 26 Oct 2006 to 28 May 2012