Overview The Business Problem Outlook.com has hundreds of millions of active users, offering an integrated solution of email, calendar, task management, and more. It is trusted to provide secure communication; however, its popularity makes it a prime target for fraudsters looking to abuse new accounts to extort money or obtain sensitive information using malicious emails. Cloud-based email platforms are under constant attack from fraudsters looking to create fake email accounts to commit downstream fraud. Attackers use bogus accounts to attempt to blackmail individuals with unfounded threats of revealing compromising information to their contacts. As legacy controls were unable to stop this abuse, Microsoft turned to SMS tokens to stamp out fake new accounts and abuse. Unf

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