A U.S. court allowed Microsoft to seize several websites it said belonged to a Vietnamese operation that allegedly sold hundreds of millions of fake Microsoft accounts, an unusual step in the ongoing fight against online fraud and cybercrime. Microsoft said in a blog post on Wednesday that the group operated at least four websites that were seized. One site tied to the operation, Hotmailbox, was a popular source to buy fake Hotmail accounts, a service owned by Microsoft, in bulk. Microsoft said Hotmailbox frequently sold those to cybercriminals. Microsoft’s decision to sue for custody of the site was in large...