Updated: Lync 2013 Cumulative Updates List

To ensure that you have the latest version of the Lync client, and the latest update, check out this frequently updated list of all client release versions for Microsoft Lync 2013.

Authors: Akshat Nigam, Microsoft Senior Support Engineer and Thomas Binder, Microsoft UC Voice Architect

Published: March 26, 2013

Updated: August 13, 2014

Product version: Lync 2013

One of the most common checks that we do when troubleshooting Lync client issues is determining whether you are running the latest version of the Lync client and if all patches are installed.

A majority of the Lync client issues that get reported are resolved by upgrading to the latest release or update of the product. Thus, we highly recommended that you install the latest version of the Lync client, along with the latest updates, before you contact Microsoft Product Support. This article will help you identify the correct release version number.

To check the client version, from within your client, navigate to About Microsoft Lync, as shown in Figure 1 below.


Figure 1. Navigating to the About Microsoft Lync option

The version number in Lync 2013 is usually within the brackets on the very first line, as shown in Figure 2 below (15.0.4481.1000).

Figure 2. Locating the Lync 2013 version number

Another way to check the client version is to look at the client UCCP log (Lync-UccApi-*.uccapilog, usually located in %localappdata% \Microsoft\Office\15.0\Lync\Tracing folder) and look at any of the outgoing messages. For example, look at the initial REGISTER sent from the client, as follows:

03/19/2013|13:52:48.932 32B4:D24 INFO :: REGISTER sip:microsoft.com SIP/2.0

Via: SIP/2.0/TLS

Max-Forwards: 70

From: <sip:aknigam@microsoft.com>;tag=8d6944b91c;epid=a554a82bae

To: <sip:aknigam@microsoft.com>

Call-ID: 96b832d9529c4ba6a507bd949df669c1


Contact: <sip:;transport=tls;ms-opaque=a0c406957f>;methods="INVITE, MESSAGE, INFO, OPTIONS, BYE, CANCEL, NOTIFY, ACK, REFER, BENOTIFY";proxy=replace;+sip.instance="<urn:uuid:A9DAFFF9-9C28-54F8-8F9A-048C53083BEB>"

User-Agent: UCCAPI/15.0.4481.1000 OC/15.0.4481.1000 (Microsoft Lync)

Supported: gruu-10, adhoclist, msrtc-event-categories

Supported: ms-forking

Supported: ms-cluster-failover

Supported: ms-userservices-state-notification

ms-keep-alive: UAC;hop-hop=yes

Event: registration

Content-Length: 0

Now that you have the version number, how do you know which release is running on the client?

Each update (All Lync updates are cumulative updates) that is released by Microsoft for Lync has its own version number. You can determine the version number associated with an update by looking at the related KB article and noting the version of 'Lync.lync.exe' in the File Information section of the article.

For quick reference, the following table lists the versions, release month, year, and a link to the KB article for all Lync 2013 updates released through August 2014:


Release Month, Year

Link to KB Article





 February, 2013



 March, 2013



 May, 2013



 July, 2013



 August, 2013



 September, 2013



February, 2014
(Office 2013 Service Pack 1)



 March, 2014



April, 2014


15.0.4615.1001 May, 2014 http://support.microsoft.com/kb/2880980
15.0.4623.1000 June, 2014 http://support.microsoft.com/kb/2850074
15.0.4641.1000 August, 2014 http://support.microsoft.com/kb/2881070
15.0.4649.1000 September, 2014 http://support.microsoft.com/kb/2889860
15.0.4659.1001   October, 2014 http://support.microsoft.com/kb/2889929
15.0.4667.1001 November, 2014 http://support.microsoft.com/kb/2899507 


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Keywords: Lync 2013, Lync 2013 Release Versions, Lync 2013 Cumulative Updates


Comments (17)
  1. Craig says:

    There’s a more up-to-date list over here:

  2. Here you will find all the latest updates for Server and Lync/Skype for Business Clients

Comments are closed.