Microsoft Lystavlen - the Online display board

Lystavlen is the danish word for 'the display board'. This blog is all about sharing the beauty of Microsoft Online Services

Lync Online interoperability with Exchange Server

Lync Online interoperability with Exchange Server

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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 for more). The presence information in Outlook is provided via the Lync Client and Lync relies on Exchange Web Services (EWS) and Exchange Autodiscover service to retrieve information for Availability, for Free/Busy, for Out of Office, and for Contact Search.


When all of the following conditions are true ...

  • The Office 365 user is licensed for Lync Online only
  • The Office 365 Lync Online user has an on-premises Exchange mailbox
  • Active Directory Synchronization (Dirsync) is not in place 

... the Lync Online user object in the Office 365 directory won’t have an SMTP address stamped. With no SMTP address available, the Lync Client can't query the on-premises Autodiscover and EWS endpoints to retrieve Free/Busy and Out of Office info. In this situation you must either 

  • implement DirSync - or -
  • assign an Exchange Online license to the Lync Online user (probably not a desired option)

See also

  • You have described exactly what I'm running into. The problem is that I have a SBS 2011 server, and I can't implement DirSync on it without setting up a second server. Is there a third option by chance? Any way to set the SMTP address via remote powershell?

    Any help would be appreciated. Thanks.

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