Out of the box, if you want to log into Outlook Web App, you need to use the Domain\Username format, like so Seeing as how Microsoft are making a big song and dance about using UPN’s to log into Office 365, I thought they might have changed from the NT4 way of doing things, but hey what do I know? Our community of experts have been thoroughly vetted for their expertise and industry experience. After 365 days of inactivity, your email will be deleted and cannot be recovered.
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