Yahoo Site Explorer is not showing all link data. Yahoo has recently posted an update for us on that topic.
Recently, some of you noticed changes in counts for Site Explorer results, where the counts were different for logged-in users versus logged-out users.
While the counts have been incorrect in some cases, the actual returned results have been correct. However, we did roll out a product fix yesterday and will be rolling out a couple more over the next few days to resolve this difference in counts some of you have observed.
Please disregard any counts for inlinks reported by Site Explorer from October 11 through next week. Thank you for raising this issue.
Priyank Garg
Yahoo! Search
source:
Yahoo! Search Blog: Update on Site Explorer Results and Counts Data