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Starting in October 2013, new Microsoft Advertising and Microsoft Advertising Editor customers will sign up using a Microsoft account and existing customers will be asked to transition to a Microsoft account if they haven't already. The transition is optional for now, but is recommended for security reasons.
If you follow the instructions, you will be asked to sign in with an existing Microsoft account or to create a new one. Once you change to using a Microsoft account for sign in, you can no longer use your Microsoft Advertising user name and password.
If you click Remind me later, you will occasionally see the option to sign in with a Microsoft account until you make the transition.