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Tom Arbuthnot MCSM Communications

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Why does Lync client Configuration Information say UCS Connection State Exchange Connection Down ?

Published 17/12/2011 - 9 Comments


I’ve been asked this one a couple of times from customers now so thought it would be worth clarifying. First of all, how do you see Lync client configuration information

A standard right click on the Lync tray icon will give you this menu


but, if you hold ctrl and right click you will get an additional configuration information option


Click it and you will get all kinds of useful configuration information. In this case, Lync is working perfectly, including conversation history and visual voicemail. We can see MAPI and EWS status are ok, so why does it say UCS Connection State Exchange connection down?


The Answer:

UCS stands for Unified Contact Store which according to that link allowed you to store your contact list on exchange, but the feature was dropped from Lync 2010 RTM. So it won’t show as connected and you don’t need to worry about it.

Hope that helps.


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.


soder - 17/12/2011 Reply

Apart from that single technet article, I cannot find any other reference to the statement about dropping this feature (not even an official statement from MS), so either that guy in the technet forum is a more-than-well-informed insider, or he just shares his own “feelings” without any way to confirm what he’s saying is true or false.

    Tom Arbuthnot - 17/12/2011 Reply

    I can’t find any official statement to reference, but since it was never an RTM feature that seems unlikely. However I trust Tom Pacyk and have had it verified from other people offline.

      soder - 17/12/2011 Reply

      Contacts Enhancements –> If your organization has deployed Microsoft Exchange Server 2010, a single unified contact store for contacts across Lync, the Microsoft Outlook messaging and collaboration client, and other endpoints eliminates the need to maintain multiple contact lists, and provides a consistent experience across programs.

      Actually that may just be marketing bullsh*t (only the writer of this article can translate what this fancy paragraph should really mean to customers)

Randy Wintle - 19/12/2011 Reply

I can confirm there was an additional feature, where there would be a true contact store that was shared between exchange and Lync that was cut from the product.

This is often confused with Lync’s ability to create contacts in exchange, and exchange contacts to show in lync searches.

Tom’s article is correct. Take it from someone who was working with the product in the early betas and heavily involved throughout the entire process…

    Tom Arbuthnot - 19/12/2011 Reply

    Thanks for the comment Randy


Bryan - 03/07/2014 Reply

I am assuming that they same is true in Lync 2013.

HGM - 17/03/2015 Reply

I don’t understand. You say the feature was “dropped in Lync 2010 RTM” then why does the message still appear in Lync 2013?

Bernd Webster - 15/02/2016 Reply

The message by the way also appears in Skype for Business …

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