Yahoo uses the Bingbot at least in the US and Canada to power its search results.
Does anyone have some sources on which bot Yahoo uses in other countries?
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According to Yahoo’s documentation for webmasters, yes, they use Bing’s index for Yahoo Search, and they don’t mention any geographic restriction:
Are you a webmaster or website owner looking to remove your webpage(s) from Yahoo Search?
Search results on Yahoo Search are now powered by Bing. […]
In the footer of their SERPs, it says "Powered by Bing™", which is also the case for localized versions of their search engine, e.g., for their site for Germany.
And when you try to manually submit your site, they link to Bing’s webmaster tools (again, also for the German version).
That doesn’t mean that Yahoo is not operating other crawlers, it just means that they don’t use their crawlers for indexing new documents for inclusion in Yahoo Search. For example, Yahoo operates Slurp (which used to be their Yahoo Search crawler), which has the following jobs:
Slurp collects content from partner sites for inclusion within sites like Yahoo News, Yahoo Finance and Yahoo Sports.
It also accesses pages from sites across the Web to confirm accuracy and improve Yahoo's personalized content for our users.
It seems so. I did some research and I am finding that Yahoo! will use Bing for search period. It seems that Yahoo! is giving up running a search engine despite the fact that they own Inktomi which was one of the worlds larges indexes at one time even rivaling Google.
It is seen as a way to drastically cut costs by removing the most expensive part of search and reducing head count. Yahoo! sees itself as a web portal and not so much a search engine while Bing and Google remain mostly search engines though Google has expanded into other ventures of late. Yahoo! may have been in a bit of a financial crunch and the move might have been thought of as a way to save the companies future though this has not been nailed down as fact but speculation.
This seems to severely limit the properties that Yahoo! has. When the deal time-frame is over, Yahoo! will not have search of it's own and will become rather useless without it. Too many eggs in one basket in my opinion. But it did give Microsoft a 28% +/- market share and a platform to better compete with Google. Yahoo! will retain a large bulk of it's advertising revenue something in the neighborhood of 80-85%.