UC, Minimum Lync and Skype for Business Client Versions Required

This page describes the minimum versions of Lync and Skype for Business that can connect to the campus Skype for Business servers.

If the Lync or Skype for Business client on your computer does not meet the minimum version requirement, the campus Skype for Business servers may send you warnings or deny you the ability to log in. If you need assistance with the update process, please contact your local IT Professional or contact the Help Desk (217-244-7000).

What are the minimum supported Lync and Skype for Business client versions?

As of February 9, 2017:

Client Minimum version
Windows Lync 2010 client 4.0.7577.4521
Windows Skype for Business 2015 client 15.0.4893.1000
Windows Skype for Business 2016 client 16.0.4483.1000
Windows Skype for Business 2016 (Office 365 version) 16.0.6965.2117
Lync for Mac 2011 client 14.4.1 (160608)

Clients not listed above will experience no change in their behavior. However, we strongly encourage any mobile users to install the Skype for Business client for their mobile devices and discontinue the use of any "Lync" branded mobile clients.

Note:  A fresh install of the Skype for Business or Lync client will need updates in order to get to the minimum version.  Please run Windows Update or Office Update to install any relevant patches.

How do I check if I am running at least the minimum client version?

NOTE: There is an issue with displaying the correct version number in the Skype for Business versions of the Windows client. If you are receiving a message stating that your version is out of date, please follow the steps listed under "How do I upgrade if I am below the minimum client version?" below. If you need further assistance, please contact your local IT Professional or contact the Help Desk (217-244-7000).

  • Skype for Business client on Windows
      1. Click the arrow next to the configuration gear on the Skype for Business window.
      2. Click Help.
      3. Click About Skype for Business.
      4. Check the version number in the "About Skype for Business" window that appears.

      Version Check

       Version Check 2

  • Lync 2011 client on Mac OS X
      1. Click the Lync menu.
      2. Click About Lync...
      3. Check the version number in the "About Microsoft Lync" window that appears.

      Lync 2011 Version Check

  • Lync 2010 client on Windows
      1. Click the arrow next to the configuration gear on the Lync 2010 window.
      2. Click Help.
      3. Click About Microsoft Lync.
      4. Check the version number in the "About Microsoft Lync" window that appears.

      Lync 2010 Version Check


How do I upgrade if I am below the minimum client version?

  • How to update Lync 2010 or Skype for Business on Windows

      1. On Windows 7
      2. Click the Start button.
      3. In the "Search programs and files" box, type wuapp.exe.
      4. In the Windows Update control panel, click Check for Updates in the left column.
      5. Install any Windows Updates and reboot, if prompted.

      Windows Update


        On Windows 8.1
      1. Right-click the Windows icon in the lower right corner of your screen and then click Control Panel.
      2. Click System and Security.
      3. Under Windows Update, click Check for Updates.
      4. If updates are found, click Install Updates.


        On Windows 10
      1. Click Start and then click Settings.
      2. Click Update & Security.
      3. Click Windows Update.
      4. Click the "Check for Updates" button.


  • How to update Skype for Business 2016 client (Office 365 version) on Windows
  • How to update Lync 2011 for Mac OS X
    • The preferred method is to use Microsoft AutoUpdate on your Mac to keep your Office software up-to-date. You can manually check for updates by opening the Lync client, then going to Help > Check for Updates
      Lync 2011 Check for Updates

Or contact your IT department for help updating your Lync or Skype for Business client version.

What happens if I don't or can't upgrade?

In reality, updates to this software should indeed be getting handled automatically.  One reason why we have instituted the minimum version blocking is that without that warning sign, ultimately some customers would never know that this automatic process is failing for their machine, leaving their personal work data and machines subject to unpatched security vulnerabilities and software bugs. If you aren't able to upgrade, it is likely that your machine has not been successfully updated for some time with likely more than just the Lync or Skype for Business software being significantly out of date.

The challenge for our instructions and documentation is that we cannot address how updates are handled in a customized way across all departments and colleges. If you are having problems updating your Lync or Skype for Business client, please contact your IT department for help updating your machine. If you aren't sure who that would be, please contact the Help Desk (244-7000) and they can locate them for you.


1. Starting January 12th, 2017, Windows clients will start seeing a warning message. Lync for Mac 2011 clients cannot display a warning message.

Update Warning

2. Starting on the evening of February 9, 2017, Windows clients and Mac 2011 clients that do not meet minimum version requirements will not be able to log in and will receive error messages similar to the following messages.

Windows client

Lync 2010 Block

Lync for Mac 2011 client

Mac Lync Block

Why implement a minimum Lync/Skype for Business client policy?

  • The newest versions of the Lync/Skype for Business client provide more features and functions.
  • Older versions contain security vulnerabilities.
  • If all clients are at a minimum version, all Lync/Skype for Business users have a better experience communicating with each other.
  • Users with up-to-date client software require less technical support.



Keywords:lync, lync 2010, lync 2013, lync 2011, version, Windows, OS X, update, webstore, Skype for Business 2015, Skype for Business   Doc ID:50742
Owner:Lync M.Group:University of Illinois Technology Services
Created:2015-04-21 16:12 CSTUpdated:2017-02-13 14:58 CST
Sites:University of Illinois Technology Services
Feedback:  135   104