08:21 AM PST: Web Mail Error Code 15
Some Yahoo! Business Mail users may encounter an error while viewing their mail via the Business Mail Web Mail page:
Error Code 15
We are working to resolve this issue in a timely manner. In the interim, customers may access their Yahoo! Business Mail accounts by using a POP email program such as Microsoft Outlook or Mozilla Thunderbird.
11:57 AM PST
This issue has been resolved.