The pesky Sober worm is to blame for disrupting e-mail traffic between Comcast account holders and users of Microsoft-based e-mail, Redmond said on Friday. A variant of Sober known as Win32/Sober.Z@mm is pummeling servers at Hotmail and MSN with "unusually high mail load," causing delays in e-mail delivery to Hotmail and MSN customers, said Brooke Richardson, MSN's lead product manager. Richardson also indicated that Internet service providers besides Comcast may be having problems directing e-mail to Hotmail and MSN servers. "We are working with Comcast and other ISPs to address (the) issues," Richardson said. "We're actively working to take the...