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    Our users can login with their UPN such as Domain\Username or Username@Domain.com. However many of our users have an email address that is Username@Subdomain.Domain.com. How do we allow them to login with their email address or even just their username, as well as their UPN? In other words we want them to be able to login with any of these formats: Domain\Username, Username@Domain.com, Username, Username@SubDomain.Domain.com. 
    Monday, January 4, 2016 3:40 PM

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    You can login with the username only if you wish. There is a JavaScript trick for this. This is explain here:

    Example 2: accept SAM-account name as a login format on an AD FS form-based sign-in page https://technet.microsoft.com/en-us/library/dn636121.aspx

    There is also a possibility to use the email address for signing in instead of the UPN (or any other attribute as long as you keep them indexed and unique). This is described here: Configuring Alternate Login ID https://technet.microsoft.com/en-us/library/dn659436.aspx If you opt for this option, please note that there are some pre-requisites and some potential side effect for some of the Office 365 workloads if you also use ADFS for Office 365.

    Note: Posts are provided “AS IS” without warranty of any kind, either expressed or implied, including but not limited to the implied warranties of merchantability and/or fitness for a particular purpose.

    Monday, January 4, 2016 5:20 PM