This page provides information on Lync and Skype for Business updates for client and server, with links to the relevant KB article.
Historic Updates
Microsoft does not keep all historic updates on their servers, usually only the latest one will be available. If you require an historic update please check if it is available here.
Skype for Business / Lync Server Updates
To determine your current update level run the latest cumulative update installer which will display the currently installed version:
The following PowerShell commands may also be used:
Skype for Business
|
1 |
Get-ItemProperty HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall\* | ?{$_.DisplayName -like “*Skype for Business*”} | Sort-Object DisplayName | Select DisplayName, DisplayVersion, InstallDate | Format-Table -AutoSize |
|
1 |
Get-WmiObject -query ‘select name, version from win32_product’ | where {$_.name -like “*Skype for Business*”} | Sort-Object Name | Select Name, Version | ft -AutoSize |
As of the November 2015 Cumulative Update (6.0.9319.102) you can simply run:
|
1 |
Get-CsServerPatchVersion | ft -AutoSize |
Lync
|
1 |
Get-ItemProperty HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall\* | ?{$_.DisplayName -like “*Lync Server*”} | Sort-Object DisplayName | Select DisplayName, DisplayVersion, InstallDate | Format-Table -AutoSize |
|
1 |
Get-WmiObject -query ‘select name, version from win32_product’ | where {$_.name -like “*Lync Server*”} | Sort-Object Name | Select Name, Version | ft -AutoSize |
Database Updates
Once you have installed the SfB\Lync updates, for each server role you upgraded, you need to install database updates. This is taken care of using the following command, where <Server FQDN> = Std Edition Server/Enterprise Edition Pool SQL Backend/SQL Monitoring Backend/SQL Archiving Backend/PChat Server or SQL Backend/. Some roles may be co-located, and thats OK.
|
1 |
Install-CsDatabase -ConfiguredDatabases -SqlServerFqdn <Server FQDN> -Verbose |
-> Skype for Business Server 2019 Cumulative Update List (updated July 2019)
| Version | Cumulative Update | KB Article(s) |
|---|---|---|
| 7.0.2046.0 | RTM | N/A |
| 7.0.2046.116 | June 2019 (HF1) | KB4507638 |
| 7.0.2046.123 | July 2019 (CU1) | KB4499991 |
-> Skype for Business Server 2015 Cumulative Update List (updated Sept 2019)
The latest cumulative update can be found here which includes all previous updates.
| Version | Cumulative Update | KB Article(s) |
|---|---|---|
| 6.0.9319.0 | RTM | N/A |
| 6.0.9319.55 | June 2015 | KB3061059 |
| 6.0.9319.88 | Sept 2015 | KB3098601 |
| 6.0.9319.102 | Nov 2015 (CU1) | KB3097645 |
| 6.0.9319.235 | March 2016 (CU2) | KB3134260 |
| 6.0.9319.259 | June 2016 (CU3) | KB3149227 |
| 6.0.9319.272 | Nov 2016 (CU4) | KB3199093 |
| 6.0.9319.277 | Feb 2017 (CU4 HF1) | KB3207506 |
| 6.0.9319.281 | May 2017 (CU5) | KB4012621 |
| 6.0.9319.510 | Dec 2017 (CU6) | KB4036312 |
| 6.0.9319.514 | Jan 2018 (CU6 HF1) | KB4074701 |
| 6.0.9319.516 | March 2018 (CU6 HF2) | KB4086059 |
| 6.0.9319.534 | July 2018 (CU7) | KB4340904 |
| 6.0.9319.537 | January 2019 (CU8) | KB4464355 |
| 6.0.9319.544 | March 2019 (CU8 H1) | KB4494279 |
| 6.0.9319.548 | May 2019 (CU9) | KB4487979 |
| 6.0.9319.559 | Jul 2019 (CU10) | KB4505401 |
| 6.0.9319.562 | Aug 2019 (CU10 HF1) | KB4518735 |
-> Lync Server 2013 Cumulative Update List (updated July 2019)
The latest cumulative update can be found here which includes all previous updates.
| Version | Cumulative Update | KB Article |
|---|---|---|
| 5.0.8308.0 | RTM | N/A |
| 5.0.8308.291 | February 2013 (CU1) | KB2781550 |
| 5.0.8308.420 | July 2013 (CU2) | KB2835432 |
| 5.0.8308.556 | October 2013 (CU3) | KB2881682 |
| 5.0.8308.577 | January 2014 (CU4) | KB2905040 |
| 5.0.8308.738 | August 2014 (CU5) | KB2937305 |
| 5.0.8308.815 | Sept 2014 (CU5 HF2) | KB2987511 |
| 5.0.8308.831 | Oct 2014 (CU5 HF5) | KB3003358 |
| 5.0.8308.834 | Nov 2014 (CU5 HF6) | KB3010028 |
| 5.0.8308.857 | Dec 2014 (CU5 HF7) | KB3018232 |
| 5.0.8308.866 | Dec 2014 (CU5 HF7.1) | KB3027553 |
| 5.0.8308.872 | Feb 2015 (CU5 HF8) | KB3031065 |
| 5.0.8308.887 | May 2015 (CU5 HF9) | KB3051951 |
| 5.0.8308.920 | July 2015 (CU5 HF10) | KB3064728 |
| 5.0.8308.933 | Sept 2015 (CU6) | KB3081739 |
| 5.0.8308.941 | Dec 2015 (CU6 HF1) | KB3121213 |
| 5.0.8308.945 | Jan, 2016 (CU6 HF2) | KB3126637 |
| 5.0.8308.949 | April, 2016 (CU7) | KB3140581 |
| 5.0.8308.965 | Aug, 2016 (CU8) | KB3175336 |
| 5.0.8308.974 | Nov, 2016 (CU8 HF1) | KB3200079 |
| 5.0.8308.977 | December 2016 (CU8 HF2) | KB3212869 |
| 5.0.8308.984 | Jan, 2017 (CU8 HF3) | KB3210166 |
| 5.0.8308.987 | March 2017 (CU8 HF4) | KB4014154 |
| 5.0.8308.992 | July, 2017 (CU9) | KB4019183 |
| 5.0.8308.1001 | July 2018 (CU10) | KB4295703 |
| 5.0.8308.1068 | January 2019 (CU10 HF1) | KB4458772 |
| 5.0.8308.1091 | June 2019 (CU10 HF2) | KB4501392 |
-> Lync Server 2010 Cumulative Update List (updated July 2019)
The latest cumulative update can be found here which includes all previous updates.
| Version | Cumulative Update | KB Article(s) |
|---|---|---|
| 4.0.7577.0 | RTM | N/A |
| 4.0.7577.108 | January 2011 (CU1) | KB2467775 |
| 4.0.7577.137 | April 2011 (CU2) | KB2500442 |
| 4.0.7577.166 | July 2011 (CU3) | KB2571546 |
| 4.0.7577.183 | November 2011 (CU4) | KB2514980 |
| 4.0.7577.190 | February 2012 (CU5) | KB2670352 |
| 4.0.7577.199 | June 2012 (CU6) | KB2701585 |
| 4.0.7577.203 | October 2012 (CU7) | KB2737915 |
| 4.0.7577.216 | March 2013 (CU8) | KB2791381 |
| 4.0.7577.217 | July 2013 (CU9) | KB2860700 |
| 4.0.7577.223 | October 2013 (CU10) | KB2889610 |
| 4.0.7577.225 | January 2014 (CU11) | KB2909888 |
| April 2014 (CU12) | KB2957044 | |
| June 2014 (Security) | KB2493736 | |
| 4.0.7577.230 | September 2014 (CU13) | 2982385 | 2982388 |
| 4.0.7577.708 | December 2014 (CU14) | http://support.microsoft.com/kb/2493736 |
| 4.0.7577.710 | Feb 2015 (CU15) | KB3030726 |
| 4.0.7577.713 | May 2015 (CU16) | KB3057803 |
| 4.0.7577.728 | April 2016 (CU17) | KB3148801 |
| 4.0.7577.756 | January 2019 (CU14 HF1) | |
| 4.0.7577.766 | June 2019 (CU14 HF2) | KB4501056 |
Skype for Business / Lync Client Updates – Windows
To find the current version go to Options – Help – About Microsoft Lync / Skype for Business
-> Skype for Business 2016 Windows Client (updated July 2019)
| Version | Cumulative Update | KB Article |
|---|---|---|
| 16.0 | RTM | |
| 16.0.4288.1000 | September, 2015 (Security) | KB2910994 |
| 16.0.4300.1001 | November, 2015 (Security) | KB3085634 |
| 16.0.4312.1000 | December, 2015 (Security) | KB3114372 |
| 16.0.4339.1000 | February, 2016 | KB3114696 |
| 16.0.4363.1000 | April, 2016 (Security) | KB3114960 |
| 16.0.4393.1002 | June, 2016 | KB3115087 |
| 16.0.4405.1000 | July, 2016 | KB3115268 |
| 16.0.4417.1000 | August, 2016 (Security) | KB3115431 |
| 16.0.4432.1000 | September, 2016 | KB3118288 |
| 16.0.4456.1001 | November, 2016 | KB3127939 |
| 16.0.4471.1000 | Dec, 2016 | KB3127980 |
| 16.0.4483.1000 | Jan, 2017 | KB3128049 |
| 16.0.4498.1002 | Feb, 2017 | KB3141501 |
| 16.0.4510.1000 | March 2017 (security) | KB3178656 |
| 16.0.4522.1000 | April, 2017 | KB3178717 |
| 16.0.4534.1000 | May 9, 2017 | KB3191858 |
| 16.0.4546.1000 | June 13, 2017 | KB3203382 |
| 16.0.4561.1000 | July, 2017 | KB3213548 |
| 16.0.4588.1000 | September 12, 2017 | KB4011040 |
| 16.0.4600.1000 | October 10, 2017 | KB4011159 |
| 16.0.4615.1000 | November 7, 2017 | KB4011238 |
| 16.0.4627.1000 | December 5, 2017 | KB4011563 |
| 16.0.4639.1001 | January 2, 2018 | KB4011623 |
| 16.0.4654.1000 | February 6, 2018 | KB4011662 |
| 16.0.4666.1000 | March 6, 2018 | KB4011725 |
| 16.0.4678.1000 | April 3, 2018 | KB4018323 |
| 16.0.4690.1000 | May 1, 2018 | KB4018367 |
| 16.0.4705.1000 | June 5, 2018 | KB4022155 |
| 16.0.4717.1000 | July 10, 2018 | KB4022221 |
| 16.0.4732.1000 | August 7, 2018 | KB4032255 |
| 16.0.4756.1000 | October 2, 2018 | KB4092445 |
| 16.0.4771.1000 | November 13, 2018 | KB4461473 |
| 16.0.4783.1000 | December 4, 2018 | KB4461545 |
| 16.0.4795.1000 | January 2, 2019 | KB4461586 |
| 16.0.4810.1000 | February 6, 2019 | KB4462114 |
| 16.0.4822.1000 | March 5, 2019 | KB4462190 |
| 16.0.4834.1000 | April 2, 2019 | KB4462234 |
| 16.0.4849.1000 | May 7, 2019 | KB4464532 |
| 16.0.4861.1001 | June 4, 2019 | KB4464576 |
-> Skype for Business / Lync 2013 Windows Client (updated July 2019)
| Version | Cumulative Update | KB Article |
|---|---|---|
| 15.0.4420.1017 | RTM | |
| 15.0.4454.1506 | February, 2013 (CU1) | http://support.microsoft.com/kb/2812461 |
| 15.0.4481.1000 | March 2013 (CU2) | http://support.microsoft.com/kb/2760556 |
| 15.0.4481.1004 | May 2013 (CU3) | http://support.microsoft.com/kb/2768004 |
| 15.0.4517.1504 | July 2013 (CU4) | http://support.microsoft.com/kb/2817465 |
| 15.0.4535.1002 | September 2013 (CU5) | http://support.microsoft.com/kb/2817630 |
| December 2013 (Security) | http://support.microsoft.com/kb/2850057 | |
| 15.0.4569.1508 | March 2014 (CU6) | http://support.microsoft.com/kb/2863908 |
| 15.0.4605.1003 | April 2014 (CU7) | http://support.microsoft.com/kb/2880474 |
| 15.0.4615.1001 | May 2014 (CU8) | http://support.microsoft.com/kb/2880980 |
| 15.0.4623.1000 | June 2014 (CU9) | http://support.microsoft.com/kb/2850074 |
| June 2014 (Security) | http://support.microsoft.com/kb/2881013 | |
| 15.0.4641.1000 | August 2014 (CU10) | http://support.microsoft.com/kb/2881070 |
| 15.0.4641.1000 | August 2014 (LyncHelp) | http://support.microsoft.com/kb/2881083 |
| 15.0.4641.1001 | Sept 2014 (CU11) | http://support.microsoft.com/kb/2889860 |
| 15.0.4659.1000 | Oct 2014 (CU12) | http://support2.microsoft.com/kb/2889929 |
| 15.0.4667.1000 | Nov 2014 (CU13) | https://support.microsoft.com/kb/2899507 |
| 15.0.4693.1000 | Feb 2015 (CU14) | http://support2.microsoft.com/kb/2920744 |
| 15.0.4701.1000 | Mar 2015 (CU15) | https://support.microsoft.com/kb/2956174 |
| 15.0.4711.1002 | April 2015 (CU16)* | KB2889923 | KB2889853 |
| 15.0.4719.1000 | May 2015 (Security) | KB3039779 |
| 15.0.4727.1001 | June 2015 (CU17) | KB3054791 |
| 15.0.4745.1000 | August 2015 (Security) | KB3055014 |
| 15.0.4753.1000 | Sept 2015 (Security) | KB3085500 |
| 15.0.4771.1000 | Nov 2015 (Security) | KB3101496 |
| 15.0.4779.1000 | Dec 2015 | KB3039776 |
| 15.0.4797.1000 | Feb 2016 | KB3114732 |
| 15.0.4809.1000 | April, 2016 | KB3114944 |
| 15.0.4833.1001 | June, 2016 | KB3115033 |
| 15.0.4841.1000 | July, 2016 | KB3115261 |
| 15.0.4849.1000 | August, 2016 (Security) | KB3115431 |
| 15.0.4859.1002 | Sept, 2016 | KB3118281 |
| 15.0.4875.1001 | Nov, 2016 | KB3127934 |
| 15.0.4885.1000 | Dec, 2016 | KB3127976 |
| 15.0.4893.1000 | Jan, 2017 | KB3141468 |
| 15.0.4903.1001 | Feb, 2017 | KB3161988 |
| 15.0.4911.1000 | March 14, 2017 (Security) | KB3172539 |
| 15.0.4919.1000 | April, 2017 | KB3178731 |
| 15.0.4927.1000 | May 2, 2017 | KB3191876 |
| 15.0.4933.1000 | June 13, 2017 (Security) | KB3191937 | KB3191939 |
| 15.0.4945.1000 | July 5, 2017 | KB3213574 |
| 15.0.4953.1000 | August 1, 2017 | KB4011107 |
| 15.0.4963.1000 | September 12, 2017 | KB4011107 |
| 15.0.4971.1000 | October 10, 2017 | KB4011179 |
| 15.0.4981.1000 | November 7, 2017 | KB4011255 |
| 15.0.4989.1000 | December 5, 2017 | KB4011284 |
| 15.0.4997.1000 | January 2, 2018 | KB4011638 |
| 15.0.5007.1000 | February 6, 2018 | KB4011678 |
| 15.0.5015.1000 | March 6, 2018 | KB4018290 |
| 15.0.5023.1000 | April 3, 2018 | KB4018334 |
| 15.0.5031.1000 | May 1, 2018 | KB4018377 |
| 15.0.5041.1000 | June 5, 2018 | KB4022170 |
| 15.0.5049.1000 | July 10, 2018 | KB4022225 |
| 15.0.5059.1000 | August 7, 2018 | KB4032250 |
| 15.0.5067.1000 | September 4, 2018 | KB4092457 |
| 15.0.5075.1000 | October 2, 2018 | KB4461446 |
| 15.0.5085.1000 | November 13, 2018 | KB4461487 |
| 15.0.5101.1000 | January 2, 2019 | KB4461557 |
| 15.0.5111.1000 | February 5, 2019 | KB4462135 |
| 15.0.5127.1000 | April 2, 2019 | KB4462207 |
*Skype for Business client introduced
-> Lync 2010 Windows Client (updated Aug 2017)
| Version | Cumulative Update | KB Article |
|---|---|---|
| 4.0.7577.0 | RTM version | N/A |
| 4.0.7577.0108 | January 2011 (CU1) | http://support.microsoft.com/?kbid=2467763 |
| 4.0.4577.0253 | April 2011 (CU2) | http://support.microsoft.com/?kbid=2496325 |
| 4.0.7577.280 | May 2011 (CU3) | http://support.microsoft.com/?kbid=2496325 |
| 4.0.7577.0314 | July 2011 (CU4) | http://support.microsoft.com/?kbid=2571543 |
| 4.0.7577.0330 | September 2011 (Hotfix) | http://support.microsoft.com/?kbid=2624907 |
| 4.0.7577.0336 | October 2011 (Hotfix) | http://support.microsoft.com/?kbid=2630294 |
| 4.0.7577.4051 | November 2011 (CU5) | http://support.microsoft.com/?kbid=2514982 |
| 4.0.7577.4053 | November 2011 (Hotfix) | http://support.microsoft.com/?kbid=2647415 |
| 4.0.7577.4061 | January 2012 (Hotfix) | http://support.microsoft.com/kb/2670498 |
| 4.0.7577.4064 | February 2012 (Hotfix) | http://support.microsoft.com/kb/2669896 |
| 4.0.7577.4072 | February 2012 (CU6) | http://support.microsoft.com/kb/2670326 |
| 4.0.7577.4087 | March 2012 (Hotfix) | http://support.microsoft.com/kb/2684739 |
| 4.0.7577.4098 | June 2012 (Security) | http://support.microsoft.com/kb/2693282 |
| 4.0.7577.4103 | June 2012 (CU7) | http://support.microsoft.com/kb/2701664 |
| 4.0.7577.4109 | October 2012 (Security) | http://support.microsoft.com/kb/2726382 |
| 4.0.7577.4356 | October 2012 (CU8) | http://support.microsoft.com/kb/2737155 |
| 4.0.7577.4374 | January 2013 (Hotfix) | http://support.microsoft.com/kb/2793351 |
| 4.0.7577.4378 | March 2013 (CU9) | http://support.microsoft.com/kb/2791382 |
| 4.0.7577.4384 | April 2013 (CU10) | http://support.microsoft.com/kb/2815347 |
| 4.0.7577.4398 | July 2013 (CU11) | http://support.microsoft.com/kb/2842627 |
| 4.0.7577.4409 | October 2013 (CU12) | http://support.microsoft.com/kb/2884632 |
| 4.0.7577.4419 | January 2014 (CU13) | http://support.microsoft.com/kb/2912208 |
| 4.0.7577.4445 | April 2014 (CU14) | http://support.microsoft.com/kb/2953593 |
| June 2014 (Security) | http://support.microsoft.com/kb/2963285 | |
| 4.0.7577.4461 | May 2015 (Security) | KB3051464 |
| 4.0.7577.4476 | August 2015 (Security) | KB3075593 |
| 4.0.7577.4478 | September 2015 (Security) | KB3081087 |
| 4.0.7577.4484 | November 2015 (Security) | KB3096735 |
| 4.0.7577.4486 | December 2015 (Security) | KB3115871 |
| 4.0.7577.4504 | June, 2016 | KB3171499 |
| 4.0.7577.4510 | Aug, 2016 (Security) | KB3174301 |
| 4.0.7577.4521 | Oct, 2016 (Security) | KB3188397 |
| 7577.4525 | March 14, 2017 | KB4010299 |
| 4.0.7577.4534 | June 13, 2017 | KB4020732 |
Lync Client Updates – Mac
To find the current version go to Lync – About Lync
-> Lync 2011 Mac Client (updated Mar 2016)
| Version | Cumulative Update | KB Article |
|---|---|---|
| 14.0.8 | April 2014 | KB2952672 |
| 14.0.9 | June 2014 | KB2963369 |
| 14.0.10 | Nov 2014 | KB3007876 |
| hotfix | Feb 2014 | KB3019983 |
| 14.0.11 | April 2014 | KB3037358 |
| 14.1.1 | July 2015 | KB3074981 |
| 14.2.1 | Oct 2015 | KB3098588 |
| 14.3.3.160216 | Feb 2016 | KB3098588 |
Lync Client Updates – Lync Room System
-> Lync Room System (updated Nov 2014)
| Version | Cumulative Update | KB Article |
|---|---|---|
| 15.x | Jan 2014 | http://support.microsoft.com/kb/2920616 |
| 15.x | April 2014 | http://support.microsoft.com/kb/2929207 |
| 15.10.0 | June 2014 | http://support.microsoft.com/kb/2962967 |
| 15.12.0 | Nov 2014 | http://support2.microsoft.com/kb/3011144 |
Lync Phone Edition Cumulative Update List (updated Nov 2017)
-> Polycom CX500, Polycom CX600 and Polycom CX3000
-> Polycom CX700 and LG-Nortel IP Phone 8540
** CU5 is the minimum requirement to move to CU6 and above e.g. you cannot update from CU4 to CU6, you first have to install CU5. More information can be found here.
-> Aastra 6721ip and Aastra 6725ip
Office Web Apps Server
-> Office Web Apps Server 2013
If you’re looking for a decent Office Web Apps update list check out Chris Lehr’s article here.
Cheers to UC Lobby for helping me get this started!
to Check the version i use at the Lync Shell:
Get-WmiObject -query 'select * from win32_product' | where {$_.name -like "Microsoft Lync Server*"} | Select Name, Version |ft -AutoSize
Hey Diego, thanks for the feedback! For some reason on my testing server win32_product doesn't exist. I get the following:
Get-WmiObject :
At line:1 char:1
+ Get-WmiObject -query 'select * from win32_product' | where {$_.name -like
"Micro …
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidOperation: (:) [Get-WmiObject], COMExcept
ion
+ FullyQualifiedErrorId : GetWMICOMException,Microsoft.PowerShell.Commands
.GetWmiObjectCommand
Have you seen that before??
[…] UP TO DATE! Make sure your existing servers are up to date up-front. I use Andrew Morpeth’s blog to check for updates. Make sure the OS is up to date as […]
[…] to keep us on our toes and to confuse those of us who – like Andrew – keep a rolling “CU” count of updates, Microsoft’s just released the third server update […]
HI Team,
i can see the latest lync 2013 version number (5.0.8308.965) updated. but for month it as Aug 2015 instead of Aug 2016.
5.0.8308.965 Aug, 2015 (CU18) 3182609 | 3182610 | 3182611 | 3182612 |
3182613 | 3182620 | 3182621 | 3182622
Hey, thanks for pointing that out! Will update now.
There is a typo: 15.0.4919.1000 | April, 2016 instead of April, 2017
And another typo: 4.0.7577.4521 | Oct, 2017 instead of Oct, 2016
Thanks!
Hi,
Are the windows client updates cumulative? Will the last update be enough, or do we need to install all the previous updates?
Generally its best to check the release notes because there are almost always some pre-req’s; usually Office updates.
May 2017 CU for Skype for Business 2015…. Does anyone know if this has been pulled? The MS link tells me it is no longer available
Hi, we are seeing the same but haven’t had a response from Microsoft. Soon as I hear I will let you know.
And its alive again 🙂
You beat me to it 🙂 Still unsure what happened there! Thanks for letting us know.
Hi Andrew,
I am looking for March 2017 CU update for lync server 2013 .By any chance you have any link from where it could be downloaded.
Thanks
Harshal
Hey,
Unfortunately it doent look like it. I stopped collecting historic updates a while back. I only have whats here – https://onedrive.live.com/redir?resid=FF04F2F514D1EFC!36102&authkey=!AAU0GY0RjE9ILqc&ithint=folder%2c
Hi Andrew,
Just FYI if you are still collecting these. There is an update that replaces the 2015 May CU for Aastra 6721ip and Aastra 6725ip telephones:
https://support.microsoft.com/en-us/help/3108719/december-2015-cumulative-update-for-lync-phone-edition-for-aastra-6721
Fixes:
KB 3121312 Adds the delegation settings in Lync Phone Edition devices when call forwarding is reconfigured
KB 3107804 SHA-2 signing and verification functionality is supported in Lync Phone Edition devices
KB 3107153 Lync Phone Edition devices restart constantly
Thanks
David
Thanks David, missed that one! I’ll update.
You have incorrect information for SfB Server 2015 Cumulative Updates in the first table on this page. The latest CU for SfB Server is CU7, and you list CU11. Perhaps you’ve mixed up the client and server updates, but the first table on this page are not server updates as the table header indicates. This is the accurate list of SfB Server 2015 updates: https://blogs.technet.microsoft.com/uclobby/2015/06/22/skype-for-business-2015-cumulative-update-list/