Skype to Skype minutes

These are the minutes that do not generate revenue, the free minutes, the ones I love most (of course) and that allow me to speak (with video) for free with my son in Brazil!
Comments? Only that the growth is accelerating!

Updated estimation of S2S min

eBay published its quarterly results. I therefore updated my personal tables to prepare some posts later on.

However, I noticed something weird in the Skype to Skype minutes …

The data in the red ellipse comes from the presentation of Quarter 3 2007 results.

The data below the red ellipse, comes from the current presentation published yesterday.
I looked several times to both tables, and they have the same legend. However eBay upgraded the number of minutes served by a very significant amount, quarter 3 2007 raising from 6.1 to 9.8 billion minutes served, this is a correction of the original data of more than 50%.

• Did they make a mistake and did they correct it?
• Did they improve their measuring algorithm, and did they do a backward calculation?
• Or did i miss something?

[edited:] I missed something, the slide says "Skype-to-Skype minutes are estimated; prior period amounts are updated to conform to current estimation methodology."