Update: Configuring On-Premises Lync Server 2010 Integration with Exchange Online

This article has been updated. A new section, Create a DNS SRV Record for Integration with Hosted Exchange UM, was added to this article on February 13, 2012 and the article was moved to the Lync Server 2010 TechNet Library. You can now view the content of this article at Configuring On-premises Lync Server 2010 Integration with Exchange Online.

This article describes how to configure integration between on-premises Microsoft Lync Server 2010 deployments and Exchange Online.

On-premises Lync Server 2010 supports interoperability with Exchange Online in the following ways:

  • Calendar data and out-of-office messages
  • Instant Messaging (IM) and presence interoperability in Outlook Web App
  • Voicemail interoperability

Outlook Web App can interoperate with on-premises Lync Server 2010 to provide users with instant messaging (IM) and presence within the Outlook Web App interface.

Author: Chloe Brussard and Randall DuBois

Publication date: June 28, 2011

Publication update: February 13, 2012

Product version: Lync Server 2010

Additional Information

For more information about how to configure your Lync Server 2010 deployment for Unified Messaging, see the following topics:

Lync Server Resources

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Keywords: Lync Server 2010 integration with Exchange Online

Comments (9)
  1. Prasad Thota says:

    Hello Nicklas

    Tying up ExchangeOnline to a Lync onpremise deployment requires DirSync and ADFS. Here is why.

    The mail boxes/users  in ExchangeOnline need to have a SIP URI associated with them, and DirSync does this automatically for you, when the users are dirsynced from on-prem AD to Office365.

    In addition, ExchangeOnline users would want to use their on-prem domain credentials for sign-in, and that implies having ADFS installed on-premises.

    So, DirSync and ADFS are required for this scenario to work seamlessly. Let us know if you have additional questions.

  2. David says:

    Hi, about requirements for Lync onprem integration with Exchange online, ADFS is mandatory or "only" a support for OWA single sign-on? Does it works with DirSync only? And, if Yes: how can online OWA authenticate the user to the on-premises Lync Edge?


  3. Voice System Service says:

    I have Lync Server 2010 on Premise with Voice Service included (using a Gateway). How will it work with Exchange Online?

  4. Joran Markx says:

    We currently have Exchange 2010 with an integration to Lync 2010 onpremises. We are setting up a hybrid deployment with Exchange Online and want On-premise AND cloud mailbox user to be able to use the Lync Integration. Can we have Lync integrated with
    Exchange onpremises and Exchange Online at the same time?

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