Where did all my links go?
There are widespread reports from many webmasters that Yahoo! Site Explorer has recently lost or at least stoped displaying a vast quantity of the backlinks reported by the tool.
But according to Search Engine Land, the data that’s missing now is unrelated to the Yahoo/Bing integration. Yahoo! reps said, “Yahoo! is investigating this report and will work to resolve it quickly if an issue is found, however it is unrelated to the longer term question we previously addressed regarding future support for backlinks.” Yahoo! reiterated that the long-term plan is to continue to provide external link data via Site Explorer.