Yahoo has emailed advertisers to let them know that they should expect a full transition to Bing’s search results as early as August…

…or maybe 2011.

That’s a heck of a window!

I mean, August is just around the corner and the busy holiday season is starts in just a few months. Either you’re ready to make the transition or you are not. Why have marketers go through the process of prepping for the transition, if you’re not entirely sure if it will happen now, or after the holidays?

Still, the fact that Yahoo is emailing advertisers AND warning them to prepare not just for a switch in paid search results but organic too, suggests that the switch will take place in August/September.

Yahoo suggests marketers follow these steps if they wish to be prepared for the eventual switch-over:

Compare your organic search rankings on Yahoo! Search and Bing for the keywords that drive your business, to help determine any potential impact to your traffic and sales

Decide if you’d like to modify your paid search campaigns to compensate for any changes in organic referrals that you anticipate

Review the Bing webmaster tools and optimize your website for the Bing crawler, as Bing results will be displayed for approximately 30%* of overall search query market share after this change

Oh, and Yahoo is testing some Bing results in July. Yes, this month!

Have you spotted Bing in your Yahoo results yet?

(email link via SER)