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https://www.microsoft.com/en-us/microsoft-365/blog/2014/05/06/alternate-login-id-for-office-365-reduces-dependence-on-upn/
https://docs.microsoft.com/de-de/windows-server/identity/ad-fs/operations/configuring-alternate-login-id
https://blogs.perficient.com/2015/02/24/office-365-the-limitations-of-alternate-login-id/
https://community.spiceworks.com/topic/1976373-how-can-i-have-office-365-users-login-with-their-pre-win-2000-username-only
https://books.google.de/books?id=oO5cBgAAQBAJ&pg=PA282&lpg=PA282&dq=alternate+login+id+for+office+365+reduces+dependence+on+upn
https://support.okta.com/help/s/question/0D50Z00008G7VCFSA3/how-do-i-reduce-dependency-on-upn-for-office-365
http://www.activedir.org/thread/azure-dependence-on-upn-being-mail-address/
https://www.ioz.ch/upload/rm/mccs-10sep2014-dirsync-sso-adfs.pdf?_=1486127912000
https://searchwindowsserver.techtarget.com/tip/Learn-why-Alternate-Login-ID-is-Office-365s-hidden-gem
https://microsoftintune.uservoice.com/forums/291681-ideas/suggestions/8854498-email-profile-configuration-with-alternate-login-i
https://www.anywherexchange.com/2014/01/adfs-30-with-office-365.html
https://ptgmedia.pearsoncmg.com/images/9781509304141/samplepages/9781509304141.pdf
https://jairocadena.com/2016/11/08/how-sso-works-in-windows-10-devices/