Lync Online supports presence interoperability with an on-premises deployment of Microsoft Exchange Server 2007 and Exchange Server 2010. The Lync Online service provides presence updates based on calendar information and Out of Office details that appear in Lync 2010 (see Lync Online Service Description...

To be allowed into Office 365 a user needs to be authenticated. Authentication means verifying that the user is who he/she claims to be. Once authenticated we can decide what actions the user is authorized to perform in Office 365. Identity management deals with identifying individuals in a system...

Many customers began their Office 365 journey populating the online AD (in their Office 365 tenant) using the directory synchronization tool (dirsync). For reasons of their own some customers decide to turn off (deactivate) dirsync after completing the initial sync. A few customers later on re-think...