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 2010.
Authors: Akshat Nigam, Microsoft senior Support Engineer and Thomas Binder, Microsoft UC Voice Architect
Editor: Susan S. Bradley
Publication date: March 26, 2013
Updated: April 21, 2014
Product version: Lync 2010
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 the 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 2010 is usually within the brackets on the second line, as shown in Figure 2 below (4.0.7577.4356).
Figure 2. Locating the Lync 2010 version number
Another way to check the client version is to look at the client UCCP log (communicator-uccapi-*.uccapilog) and look at any of the outgoing messages. For example, look at the initial REGISTER sent from the client, as follows:
03/19/2013|17:34:34.489 1EB4:1240 INFO :: REGISTER sip:tailspintoys.com SIP/2.0
Via: SIP/2.0/TLS 172.16.22.242:54486
CSeq: 1 REGISTER
Contact: <sip:172.16.22.242:54486;transport=tls;ms-opaque=9359f8b23d>;methods="INVITE, MESSAGE, INFO, OPTIONS, BYE, CANCEL, NOTIFY, ACK, REFER, BENOTIFY";proxy=replace;+sip.instance="<urn:uuid:13DD5A72-ED31-5804-8CB4-861885BF1564>"
User-Agent: UCCAPI/4.0.7577.4356 OC/4.0.7577.4356 (Microsoft Lync 2010)
Supported: gruu-10, adhoclist, msrtc-event-categories
Now that you have a 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.exe' in the File Information section, near the end 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 2010 updates released through March 2013.
Release Month, Year
Link to KB Article
Keywords: Lync 2010, Lync 2010 Release Versions, Lync 2010 Cumulative Updates
Keep in mind, March 2013 CU for Lync 2010 client have troubles with older workstation platforms.
I'm troubleshooting a particular uccapilog file in which the version numbers for UCCAPI and OC are not consistent:
"User-Agent: UCCAPI/4.0.7577.4356 OC/4.0.7577.4384 (Microsoft Lync 2010)"
How is this user-agent translated correctly into a Lync client version number? The user claims to have applied the April 2013 cumulative package but I would like to make sure the client update was successfull.
Is this kept up to date or not?
It would be nice to have a complete overview, but support.microsoft.com/.../2827750 is missing
Can this be updated please? Excellent resource.
Update: 4.0.7577.4446 should correspond to Security update for Lync 2010: June 2014 (https://support.microsoft.com/en-us/kb/2963285)
I am still getting the same problem when the version 7577.4445 is installed - Outlook Calendar does not sinc with MS Lync status, however it does not happen for a version 7577.4384 available for my Citrix Xenapp.
I do not have the same version of my Xenapp available to install in my customer PC. In the last couple of months I have been tried to find it.
Thanks for the great info. I really loved this. I would like to apprentice at the same time as you amend your web site, how could i subscribe for a blog site?
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