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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: June 11, 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 10.171.118.236:9673
CSeq: 1 REGISTER
Contact: <sip:10.171.118.236:9673;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
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 March 2013:
Release Month, Year
Link to KB Article
February, 2014(Office 2013 Service Pack 1)
Keywords: Lync 2013, Lync 2013 Release Versions, Lync 2013 Cumulative Updates