-- First, it would fundamentally undermine Yahoo's own strategy and long-term viability by encouraging advertisers to use Google as opposed to your Panama paid search system. This would also fragment your search advertising and display advertising strategies and the ecosystem surrounding them. This would undermine the reliance on your display advertising business to fuel future growth.

-- Given this, it would impair Yahoo's ability to retain the talented engineers working on advertising systems that are important to our interest in a combination of our companies.

-- In addition, it would raise a host of regulatory and legal problems that no acquirer, including Microsoft, would want to inherit. Among other things, this would consolidate market share with the already-dominant paid search provider in a manner that would reduce competition and choice in the marketplace.

-- This would also effectively enable Google to set the prices for key search terms on both their and your search platforms and, in the process, raise prices charged to advertisers on Yahoo. In addition to whatever resulting legal problems, this seems unwise from a business perspective unless in fact one simply wishes to use this as a vehicle to exit the paid search business in favor of Google.

-- It could foreclose any chance of a combination with any other search provider that is not already relying on Google’s search services.

Accordingly, your apparent plan to pursue such an arrangement in the event of a proxy contest or exchange offer leads me to the firm decision not to pursue such a path. Instead, I hereby formally withdraw Microsoft’s proposal to acquire Yahoo.

We will move forward and will continue to innovate and grow our business at Microsoft with the talented team we have in place and potentially through strategic transactions with other business partners.

I still believe even today that our offer remains the only alternative put forward that provides your stockholders full and fair value for their shares. By failing to reach an agreement with us, you and your stockholders have left significant value on the table.

But clearly a deal is not to be.

Thank you again for the time we have spent together discussing this.

Sincerely yours,

Steven A. Ballmer

Steven A. Ballmer

Chief Executive Officer

Microsoft Corporation