Recently we got some support request tickets regarding MAC clients which weren’t able to sign-in into Lync because they were missing the necessary root CA certificates. Those root CA certificates are required in order to sign-in into Lync rather it’s on the internal or external network.
-->Use the links on this page to get more information about and download the most recent updates for the perpetual versions of Skype for Business 2016, Skype for Business 2015, and Lync 2013 clients.
Note
- The information in this article only applies to perpetual versions of Skype for Business that use the Windows Installer (MSI) installation technology. For example, if you installed a volume licensed version of Skype for Business, such as Skype for Business included with Office Professional Plus 2016.
- The information in this article doesn't apply to Microsoft 365 or Office 365 versions of Skype for Business, such as Skype for Business included with Microsoft 365 Apps for enterprise.
- For the latest mobile client updates, go to the app store for your mobile client (iTunes, Google Play, or Microsoft Store) to view details and install updates.
- To find out what version of Skype for Business you're using, see What version of Skype for Business do I have?
- For more information about installing Office updates, see Install Office updates.
Lync For Mac Manual Downloads; Lync For Mac Download; Known issues for Mac customers using the CX300 phone: no dial‐tone phone will not ring when status is set to Busy when ending a call, the call might be put on Hold For information on using Lync, see UIT document Using Lync for Macintosh. May 10, 2017 Microsoft Lync is the new rich client for Lync users on the Mac platform and offers integrated functionality for instant messaging, presence, conferencing and voice. Lync for Mac is designed to work with both Lync Server 2010 and Lync Online to help you. Install Microsoft Lync Mac Download; Install Microsoft Lync Mac 2016.
Skype for Business compatibility with Microsoft 365 or Office 365 and your on-premises environment depends on the system requirements for your deployment:
Microsoft 365 and Office 365 work with any version of Skype for Business that is in mainstream support, which includes the latest version of Skype for Business 2016. For previous versions of Skype for Business, only those that have extended support may continue to work with Microsoft 365 or Office 365, although with reduced functionality. For more information, see Microsoft Lifecycle Policy.
For Skype for Business Server on-premises deployments, follow the system requirements for your version of Skype for Business:
Skype for Business 2016 client updates
| Package Name | KB Number | Release Date |
|---|---|---|
| Update for Skype for Business 2016 | KB 4484133 | December 2019 |
| Update for Skype for Business 2016 | KB 4484102 | October 2019 |
| Update for Skype for Business 2016 | KB 4475577 | September 2019 |
| Update for Skype for Business 2016 | KB 4475548 | August 2019 |
| Update for Skype for Business 2016 | KB 4475545 | July 2019 |
| Update for Skype for Business 2016 | KB 4464576 | June 2019 |
| Update for Skype for Business 2016 | KB 4464532 | May 2019 |
| Update for Skype for Business 2016 | KB 4462234 | April 2019 |
| Update for Skype for Business 2016 | KB 4462190 | March 2019 |
| Update for Skype for Business 2016 | KB 4462114 | February 2019 |
| Update for Skype for Business 2016 | KB 4461586 | January 2019 |
| Update for Skype for Business 2016 | KB 4461545 | December 2018 |
| Security update for Skype for Business 2016 | KB 4461473 | November 2018 |
| Update for Skype for Business 2016 | KB 4092445 | October 2018 |
| Update for Skype for Business 2016 | KB 4032255 | August 2018 |
| Security update for Skype for Business 2016 | KB 4022221 | July 2018 |
| Update for Skype for Business 2016 | KB 4022155 | June 2018 |
| Update for Skype for Business 2016 | KB 4018367 | May 2018 |
| Update for Skype for Business 2016 | KB 4018323 | April 2018 |
| Update for Skype for Business 2016 | KB 4011725 | March 2018 |
| Update for Skype for Business 2016 | KB 4011662 | February 2018 |
| Update for Skype for Business 2016 | KB 4011623 | January 2018 |
| Update for Skype for Business 2016 | KB 4011563 | December 2017 |
| Update for Skype for Business 2016 | KB 4011238 | November 2017 |
| Security update for Skype for Business 2016 | KB 4011159 | October 2017 |
| Security update for Skype for Business 2016 | KB 4011040 | September 2017 |
| Update for Skype for Business 2016 | KB 3213548 | July 2017 |
| Security update for Skype for Business 2016 | KB 3203382 | June 2017 |
| Security update for Skype for Business 2016 | KB 3191858 | May 2017 |
| Update for Skype for Business 2016 | KB 3178717 | April 2017 |
| Security update for Skype for Business 2016 | KB 3178656 | March 2017 |
| Update for Skype for Business 2016 | KB 3141501 | February 2017 |
| Update for Skype for Business 2016 | KB 3128049 | January 2017 |
| Update for Skype for Business 2016 | KB 3127980 | December 2016 |
| Update for Skype for Business 2016 | KB 3127939 | November 2016 |
| Security update for Skype for Business 2016 | KB 3118327 | October 2016 |
| Update for Skype for Business 2016 | KB 3118288 | September 2016 |
| Security update for Skype for Business 2016 | KB 3115408 | August 2016 |
| Update for Skype for Business 2016 | KB 3115268 | July 2016 |
| Update for Skype for Business 2016 | KB 3115087 | June 2016 |
| Security update for Skype for Business 2016 | KB 3114960 | April 2016 |
| Update for Skype for Business 2016 | KB 3114846 | March 2016 |
| Update for Skype for Business 2016 | KB 3114696 | February 2016 |
| Update for Skype for Business 2016 | KB 3114516 | January 2016 |
| Security update for Skype for Business 2016 | KB 3114372 | December 2015 |
| Security update for Skype for Business 2016 | KB 3085634 | November 2015 |
| Security update for Skype for Business 2016 | KB 2910994 | September 2015 |
Skype for Business 2015 client updates
| Package Name | KB Number | Release Date |
|---|---|---|
| Update for Skype for Business 2015/Lync 2013 | KB 4475519 | July 2019 |
| Update for Skype for Business 2015/Lync 2013 | KB 4464593 | June 2019 |
| Update for Skype for Business 2015/Lync 2013 | KB 4464547 | May 2019 |
| Update for Skype for Business 2015/Lync 2013 | KB 4462207 | April 2019 |
| Update for Skype for Business 2015/Lync 2013 | KB 4461557 | January 2019 |
| Security update for Skype for Business 2015/Lync 2013 | KB 4461487 | November 2018 |
| Update for Skype for Business 2015/Lync 2013 | KB 4461446 | October 2018 |
| Update for Skype for Business 2015/Lync 2013 | KB 4092457 | September 2018 |
| Update for Skype for Business 2015/Lync 2013 | KB 4032250 | August 2018 |
| Security update for Skype for Business 2015/Lync 2013 | KB 4022225 | July 2018 |
| Update for Skype for Business 2015/Lync 2013 | KB 4022170 | June 2018 |
| Update for Skype for Business 2015/Lync 2013 | KB 4018377 | May 2018 |
| Update for Skype for Business 2015/Lync 2013 | KB 4018334 | April 2018] |
| Update for Skype for Business 2015/Lync 2013 | KB 4018290 | March 2018 |
| Update for Skype for Business 2015/Lync 2013 | KB 4011678 | February 2018 |
| Update for Skype for Business 2015/Lync 2013 | KB 4011638 | January 2018 |
| Update for Skype for Business 2015/Lync 2013 | KB 4011284 | December 2017 |
| Update for Skype for Business 2015/Lync 2013 | KB 4011255 | November 2017 |
| Security update for Skype for Business 2015/Lync 2013 | KB 4011179 | October 2017 |
| Security update for Skype for Business 2015/Lync 2013 | KB 4011107 | September 2017 |
| Lynchelploc Security update for Skype for Business 2015/Lync 2013 | KB 3213568 | September 2017 |
| Update for Skype for Business 2015/Lync 2013 | KB 4011046 | August 2017 |
| Update for Skype for Business 2015/Lync 2013 | KB 3213574 | July 2017 |
| Security update for Skype for Business 2015/Lync 2013 | KB 3191939 | June 2017 |
| Security update for Skype for Business 2015/Lync 2013 | KB 3191937 | June 2017 |
| Lynchelploc update for Skype for Business 2015/Lync 2013 | KB 3191873 | May 2017 |
| Update for Skype for Business 2015/Lync 2013 | KB 3191876 | May 2017 |
| Lynchelploc update for Skype for Business 2015/Lync 2013 | KB 3172492 | April 2017 |
| Update for Skype for Business 2015/Lync 2013 | KB 3178731 | April 2017 |
| Security update for Skype for Business 2015/Lync 2013 | KB 3172539 | March 2017 |
| Update for Skype for Business 2015/Lync 2013 | KB 3161988 | February 2017 |
| Update for Skype for Business 2015/Lync 2013 | KB 3141468 | January 2017 |
| Update for Skype for Business 2015/Lync 2013 | KB 3127976 | December 2016 |
| Update for Skype for Business 2015/Lync 2013 | KB 3127934 | November 2016 |
| Security update for Skype for Business 2015/Lync 2013 | KB 3118348 | October 2016 |
| Update for Skype for Business 2015/Lync 2013 | KB 3118281 | September 2016 |
| Security update for Skype for Business 2015/Lync 2013 | KB 3115431 | August 2016 |
| Update for Skype for Business 2015/Lync 2013 | KB 3115261 | July 2016 |
| Update for Skype for Business 2015/Lync 2013 | KB 3115033 | June 2016 |
| Security update for Skype for Business 2015/Lync 2013 | KB 3114944 | April 2016 |
| Update for Skype for Business 2015/Lync 2013 | KB 3114831 | March 2016 |
| Update for Skype for Business 2015/Lync 2013 | KB 3114732 | February 2016 |
| Update for Skype for Business 2015/Lync 2013 | KB 3114502 | January 2016 |
| Security update for Skype for Business 2015/Lync 2013 | KB 3114351 | December 2015 |
| Security update for Skype for Business 2015/Lync 2013 | KB 3039776 | December 2015 |
| Security update for Skype for Business 2015/Lync 2013 | KB 3101496 | November 2015 |
| Update for Skype for Business 2015/Lync 2013 | KB 3085581 | October 2015 |
| Security update for Skype for Business 2015/Lync 2013 | KB 3085500 | September 2015 |
| Security update for Skype for Business 2015/Lync 2013 | KB 3055014 | August 2015 |
| Update for Skype for Business 2015/Lync 2013 | KB 3054791 | June 2015 |
Skype for Business on Mac client updates
Lync 2013 client updates
| Package Name | KB Number | Release Date |
|---|---|---|
| Update for Skype for Business 2015/Lync 2013 | KB 4462207 | April 2019 |
| Update for Skype for Business 2015/Lync 2013 | KB 4461557 | January 2019 |
| Security update for Skype for Business 2015/Lync 2013 | KB 4461487 | November 2018 |
| Update for Skype for Business 2015/Lync 2013 | KB 4461446 | October 2018 |
| Update for Skype for Business 2015/Lync 2013 | KB 4092457 | September 2018 |
| Update for Skype for Business 2015/Lync 2013 | KB 4032250 | August 2018 |
| Security update for Skype for Business/Lync 2013 | KB 4022225 | July 2018 |
| Update for Skype for Business 2015/Lync 2013 | KB 4022170 | June 2018 |
| Update for Skype for Business 2015/Lync 2013 | KB 4018377 | May 2018 |
| Update for Skype for Business 2015/Lync 2013 | KB 4018334 | April 2018 |
| Update for Skype for Business 2015/Lync 2013 | KB 4018290 | March 2018 |
| Update for Skype for Business 2015/Lync 2013 | KB 4011678 | February 2018 |
| Update for Skype for Business 2015/Lync 2013 | KB 4011638 | January 2018 |
| Update for Skype for Business 2015/Lync 2013 | KB 4011284 | December 2017 |
| Update for Skype for Business 2015/Lync 2013 | KB 4011255 | November 2017 |
| Security update for Skype for Business 2015/Lync 2013 | KB 4011179 | October 2017 |
| Security update for Skype for Business 2015/Lync 2013 | KB 4011107 | September 2017 |
| Security update for Skype for Business 2015/Lync 2013 | KB 3213568 | September 2017 |
| Update for Skype for Business 2015/Lync 2013 | KB 4011046 | August 2017 |
| Update for Skype for Business 2015/Lync 2013 | KB 3213574 | July 2017 |
| Update for Skype for Business 2015/Lync 2013 | KB 3191939 | June 2017 |
| Security update for Skype for Business 2015/Lync 2013 | KB 3191937 | June 2017 |
| Lynchelploc update for Skype for Business 2015/Lync 2013 | KB 3191873 | May 2017 |
| Update for Skype for Business 2015/Lync 2013 | KB 3191876 | May 2017 |
| Update for Skype for Business 2015/Lync 2013 | KB 3172492 | April 2017 |
| Update for Skype for Business 2015/Lync 2013 | KB 3178731 | April 2017 |
| Security update for Skype for Business 2015/Lync 2013 | KB 3172539 | March 2017 |
| Update for Skype for Business 2015/Lync 2013 | KB 3161988 | February 2017 |
| Update for Skype for Business 2015/Lync 2013 | KB 3141468 | January 2017 |
| Update for Skype for Business 2015/Lync 2013 | KB 3127976 | December 2016 |
| Update for Skype for Business 2015/Lync 2013 | KB 3127934 | November 2016 |
| Security update for Skype for Business 2015/Lync 2013 | KB 3118348 | October 2016 |
| Update for Skype for Business 2015/Lync 2013 | KB 3118281 | September 2016 |
| Security update for Skype for Business 2015/Lync 2013 | KB 3115431 | August 2016 |
| Update for Skype for Business 2015/Lync 2013 | KB 3115261 | July 2016 |
| Update for Skype for Business 2015/Lync 2013 | KB 3115033 | June 2016 |
| Security update for Skype for Business 2015/Lync 2013 | KB 3114944 | April 2016 |
| Update for Skype for Business 2015/Lync 2013 | KB 3114831 | March 2016 |
| Update for Skype for Business 2015/Lync 2013 | KB 3114732 | February 2016 |
| Update for Skype for Business 2015/Lync 2013 | KB 3114502 | January 2016 |
| Update for Skype for Business 2015/Lync 2013 | KB 3039776 | December 2015 |
| Security update for Skype for Business 2015/Lync 2013 | KB 3114351 | December 2015 |
| Security update for Skype for Business 2015/Lync 2013 | KB 3101496 | November 2015 |
| Update for Skype for Business 2015/Lync 2013 | KB 3085581 | October 2015 |
| Security update for Skype for Business 2015/Lync 2013 | KB 3085500 | September 2015 |
| Update for Skype for Business 2015/Lync 2013 | KB 3054791 | June 2015 |
| Security update for Skype for Business 2015/Lync 2013 | KB 3039779 | May 2015 |
| Update for Skype for Business 2015/Lync 2013 | KB 2889923 KB 2889853 | April 2015 |
| Update for Lync 2013 | KB 2956174 | March 2015 |
| Update for Lync 2013 | KB 2920744 | February 2015 |
| Update for Lync 2013 | KB 2899507 | November 2014 |
| Update for Lync 2013 | KB 2889929 | October 2014 |
| Update for Lync 2013 | KB 2889860 | September 2014 |
| Update for Lync 2013 | KB 2881083 | August 2014 |
| Update for Lync 2013 | KB 2881070 | August 2014 |
| Security Update for Lync 2013 | KB 2881013 | June 2014 |
| Update for Lync 2013 | KB 2850074 | June 2014 |
| Update for Lync 2013 | KB 2880980 | May 2014 |
| Update for Lync 2013 | KB 2880474 | April 2014 |
| Update for Lync 2013 | KB 2863908 | March 2014 |
| Security Update for Lync 2013 | KB 2850057 | September 2013 |
| Update for Lync 2013 | KB 2817630 | December 2013 |
| Update for Lync 2013 | KB 2817465 | July 2013 |
| Update for Lync 2013 | KB 2768004 | May 2013 |
| Update for Lync 2013 | KB 2760556 | March 2013 |
| Update for Lync 2013 | KB 2812461 | February 2013 |
Lync Phone Edition updates
| Package Name | KB Number | Release Date |
|---|---|---|
| Cumulative update for Lync Phone Edition for Aastra 6721ip and Aastra 6725ip telephone | KB 4019527 | April 2017 |
| Cumulative update for Microsoft Lync Phone Edition for HP 4110 and HP 4120 telephones | KB 4019528 | April 2017 |
| Cumulative update for Microsoft Lync Phone Edition for Polycom CX500, Polycom CX600, and Polycom CX3000 telephones | KB 4019529 | April 2017 |
| Cumulative Update for Lync Phone Edition for Aastra 6721ip and Aastra 6725ip telephones | KB 3050585 | May 2015 |
| Cumulative update for Lync Phone Edition for HP 4110 and HP 4120 telephones | KB 3050587 | May 2015 |
| Cumulative update for Lync Phone Edition for Polycom CX500, Polycom CX600, and Polycom CX3000 | KB 3050588 | May 2015 |
| Cumulative update for Lync Phone Edition for Polycom CX700 and LG-Nortel IP Phone 8540 telephones | KB 3050590 | May 2015 |
| Cumulative update for Lync Phone Edition for Aastra 6721ip and Aastra 6725ip telephones | KB 2954032 | April 2014 |
| Cumulative update for Lync Phone Edition for HP 4110 and HP 4120 telephones | KB 2954033 | April 2014 |
| Cumulative update for Lync Phone Edition for Polycom CX500, Polycom CX600, and Polycom CX3000 telephones | KB 2954034 | April 2014 |
| Cumulative update for Lync Phone Edition for Polycom CX700 and LG-Nortel IP Phone 8540 telephones | KB 2954035 | April 2014 |
Lync Phone Edition clients on Download Center
| Package Name | Release Date |
|---|---|
| Lync Phone Edition for HP 4110 and HP 4120 | April 2017 |
| Lync Phone Edition for Polycom CX500, Polycom CX600 and Polycom CX3000 | April 2017 |
| Lync Phone Edition for Polycom CX700 and LG-Nortel IP Phone 8540 | December 2015 |
Lync Basic 2013 Software
| Package Name | Release Date |
|---|---|
| Lync Basic 2013 (32-bit) | October 2012 |
| Lync Basic 2013 (64-bit) | October 2012 |
Lync for Mac 2011 client updates
| Package Name | KB Number | Release Date |
|---|---|---|
| Update for Lync for Mac 2011 | KB 3175174 | July 2016 |
| Cumulative updates for Lync for Mac 2011 | KB 3074981 | July 2015 |
Lync 2010 client updates
| Package Name | KB Number | Release Date |
|---|---|---|
| Security update for Lync 2010 | KB 4025865 | September 2017 |
| Security update for Lync 2010 | KB 4010732 | June 2017 |
| Security update for Lync 2010 | KB 4010299 | March 2017 |
| Security update for Lync 2010 | KB 3188397 | October 2016 |
| Security update for Lync 2010 | KB 3174301 | August 2016 |
| Update for Lync 2010 | KB 3171499 | June 2016 |
| Security update for Lync 2010 | KB 3115871 | December 2015 |
| Security update for Lync 2010 | KB 3096735 | November 2015 |
| Security update for Lync 2010 | KB 3081087 | September 2015 |
| Cumulative updates for Lync 2010 | KB 3072611 | July 2015 |
Lync 2010 Attendant updates
| Package Name | KB Number | Release Date |
|---|---|---|
| Cumulative update for Lync 2010 Attendant | KB 2842632 | July 2013 |
Lync 2010 Attendee updates
Microsoft Lync For Mac Download
| Package Name | KB Number | Release Date |
|---|---|---|
| Security update for Lync 2010 Attendee (admin level install) | KB 4025866 | September 2017 |
| Security update for Lync 2010 Attendee (admin level install) | KB 4025866 | June 2017 |
| Security update for Lync 2010 Attendee (user level install) | KB 4020734 | June 2017 |
| Security update for Microsoft Graphics Component on Lync 2010 Attendee (admin level install) | KB 4010301 | March 2017 |
| Security update for Lync 2010 Attendee (admin level install) | KB 3188400 | October 2016 |
| Description of the cumulative update for the Lync 2010 Attendee - Administrator level installation | KB 3171502 | June 2016 |
| Description of the cumulative update for the Lync 2010 Attendee - User level installation | KB 3171496 | June 2016 |
| Security update for Lync 2010 Attendee (admin-level installation) | KB 3081089 | September 2015 |
| Security update for Lync 2010 Attendee (user-level installation) | KB 3081088 | September 2015 |
Attendant
| Package Name/Link | Release Date |
|---|---|
| Lync 2010 Attendant (32 Bit) | November 2010 |
| Lync 2010 Attendant (64 Bit) | November 2010 |
Attendee
| Package Name/Link | Release Date |
|---|---|
| Lync 2010 Attendee - Admin Level Install | April 2013 |
| Lync 2010 Attendee - User Level Install | June 2014 |