It seemed like a very viable option for organizations that had dependencies on their current UPNs and would not be able to easily change their UPNs. The idea was that instead of changing the UPNs in your on-premises Active Directory, you could use a different value to authenticate to Office 365 and sync that value to the cloud as your login.Īt the time of release, I wrote an article (“ Office 365 – Configuring AD FS & DirSync with an Alternate Login“) that covered the necessary configuration to use Alternate Login ID.
Back in April of 2014, Microsoft announced a feature called “ Alternate Login ID” (sometimes referred to as “Alternative Login ID”).