For more information on Alternate Login IDs, see article Configuring Alternate Login ID.

Important note PTA does NOT support organizations using Alternate Login IDs. Through the pass-through authentication (PTA) feature, Azure AD provides organizations with the ability to directly authenticate against the organization's Active Directory, allowing their users to use their corporate credentials to access Azure AD/Office 365 and the services that they have been provisioned for, and without the need for complex network infrastructure such as the one required by AD FS (see Part 3, Part 4(bis), and Part 5) or for the on-premises passwords to exist in the cloud in any form (see Part 6 of this whitepaper for the password hash synchronization (PHS) feature).

It represents the cloud version of the Microsoft communication and collaboration products with the latest version of the Microsoft desktop suite for businesses of all sizes.Īzure Active Directory (Azure AD) is the directory behind Office 365 used to store user identities and other tenant properties. Just like the on-premises Active Directory stores the information for Exchange, SharePoint, Lync and your custom Line of Business (LOB) apps, Azure AD stores the information for Exchange Online, SharePoint Online, Skype for Business Online, etc., and any custom applications built in the Microsoft's cloud. Microsoft Office 365 provides secure anywhere access to professional email, shared calendars, instant messaging (IM), video conferencing, document collaboration, etc.

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