The deal will mark the biggest acquisition by Adobe since its $4.3-billion purchase of Macromedia in 2005.

Omniture, based in Utah, makes software that allows firms to analyze the use of their internet sites and help them maximize advertising and retail opportunities. Adobe, whose key products include Photoshop and Flash, will pay $21.50 a share for
Omniture, a 45-percent premium on the company's closing price prior
to the acquisition.

Adobe said that its net income in the third quarter fell 29 percent to $136 million, as revenue slipped to $697.5 million from $887.3 million a year ago. The results beat Wall Street expectations, and Adobe chief executive Shantanu Narayen said he was pleased with the "solid revenue" for the quarter.