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Tom Arbuthnot MCSM Communications

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About Lync Online Meeting Plug-in for Outlook

Published 15/06/2011 - 7 Comments

Had a customer ask about the Lync Outlook Plugins today.


There are actually two plugins for Outlook


Conversation History Add-in for Microsoft Lync

Usually located at C:\Program Files (x86)\Microsoft Lync\ocoffice.dll

Online Meeting Add-in for Microsoft Lync 2010

Usually located at C:\Program Files (x86)\Microsoft Lync\ucaddin.dll

They are deployed as part of the Lync client install. There is no separate installer available.

Does this remove the OCS/Live Meeting Outlook plugin?

Not by default, but you can get the Lync installer to remove the previous Live Meeting plugin by using the following switch


Removes the Conferencing Add-in for Microsoft Office Outlook, which is the previous version of the add-in (used for scheduling Microsoft Office Live Meeting server- and service-based meetings).

Can I have pictures of my Lync contacts in Outlook?

Sure, tommy clarke has a good expenlation of how to enable this here


What if I don’t have Outlook/don’t want the plugins?

You can still do ad-hoc meetings via the Lync client, and there is also a Lync Web Scheduler available here. See this blog post from Justin Morris for details on the Web Scheduler

Lync Web Scheduler Login

Tom Arbuthnot

Tom Arbuthnot

Principal Solutions Architect at Modality Systems
Tom Arbuthnot is Principal Solutions Architect at Unified Communications specialist Modality Systems. He is a Microsoft Certified Master and MVP, blogger, has a regular podcast with UCToday at and is a regular speaker at events including Microsoft TechEd and Ignite. He co-runs The Microsoft UC User Group London.


Pazit - 20/06/2012 Reply

I actually don’t have the on-line addin presents in the outlook addin option (only the conversation history add-in)
How can i download it?


    Tom Arbuthnot - 23/06/2012 Reply

    Not sure if you can get it as a separate install. I’d just re install Lync

      George - 01/11/2012 Reply

      I have installed Office Plus 2012 RUS, but not foun? Lync link in main menu, outlook add-ons and listed dll’s on HDD. But Lync is running, when I press the Lync-link from outcome invitations.

      Separate Lync installation not found on site and in install options of office.

      Do you have ideas, what to do also?

    troopstoeducation - 05/03/2018 Reply

    Lync Web App cannot be used to schedule meetings or to exchange instant messages with individual meeting attendees.

      Tom Arbuthnot - 05/03/2018 Reply

      Correct, you would schedule in Outlook/Outlook Web App. I thought you could IM within the meeting in Lync Web app, but will double check

Cindya - 20/11/2013 Reply

I can’t find any information on the “Conversation History Add-in for Microsoft Lync 2010”. I need to know how it’s installed.

Is it installed by default when installing Lync 2010 or Outlook?

Why isn’t there a “Convo Hist Add-in” for 2013? Has it been retired or bundled up with a Lync 2013 install?

Why can’t I find anything about this one add-in online?


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