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In BPOS SharePoint Online, I used to find "<DOMAIN>\<UPN>" in my settings on SharePoint User Information Page. Plase see the image attached:
In Office 365 SharePoint 2010, I can't quite figure out where to find this info. In the place where I used to see "red001\me", I see this instead: i:email@example.com
For firstname.lastname@example.org, is the domain simply "company.onmicrosoft.com", and is my user name "me"? Where do I find this info?
The UPN "User Pricipal Name" is a consolidated login that combines a user name and domain name in one internet friendly format (e.g. email@example.com) In Office365 the UPN and MOS ID "MS Online Services ID" are the same. Ideally this is also the default SMTP address, but doesn't have to be.
When using a UPN to logon you use the entire UPN as the "user name" and leave "domain" blank.
The "i:0#.f|membership|" prefix that appears in several places throughout Office365 is a known issue that will be resolved in a future release