It’s official. Microsoft announced testing Bing search results in Yahoo! search. (http://bit.ly/ac89Ob) From our Minneapolis office, we confirm the testing is well underway. In a handful of random searches we found exactly the same sites ranking in exactly the same position and displaying exactly the same page titles and meta description lengths.
Previously, Yahoo allowed a few more characters displayed, but now both search engines are cutting page titles at the 65-70 character range, and chopping off descriptions around 165-175 characters.
In terms of the actual size of Bing and Yahoo! indices, the numbers are reported as different– but they are close.