[dodedo]

No, they didn't. Your memory of history is incorrect.

Overture, a completely different company, sued Google in 2002, two years before their IPO.

Yahoo purchased Overture in 2003. After this, Google settled.

Google's IPO wasn't until 2004.

[Steko]

Thx for correction.

Google reveals that Y! did sue X-fire apparently over a buddy list patent in 2005 which would also make the same point though.

[dodedo]

Absolutely. I should make it clear: I am not defending Yahoo's behavior here. Just trying to keep the facts factual.