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ThomasThomas (Okta, Inc.)  

How do I reduce dependency on UPN for Office 365

Best Answer chosen by Thomas (Okta, Inc.) 
ThomasThomas (Okta, Inc.) 
Microsoft recently announced changes in their Azure Active Directory configuration parameters through Directory Sync.  This change eliminates the dependency on having to ensure a user's on premise UPN match their Azure AD user name.

http://blogs.office.com/2014/05/06/alternate-login-id-for-office-365-reduces-dependence-on-upn/

http://social.technet.microsoft.com/wiki/contents/articles/24096.using-alternate-login-ids-with-azure-active-directory.aspx

This change dramatically changes the administrative steps to pass the correct credential from AD to Azure.

Original Author: JT Stoker, Sr Technical Consultant, Okta