The following is a list of Exchange Cumulative Updates and Security updates for Exchange 2019 and Exchange 2016 (Scroll down for Exchange 2013 and Exchange 2010 ) as of October 12, 2021.

Exchange 2019

• Cumulative Update 11 for Exchange Server 2019 (KB5005334, Sept 2021, https://www.microsoft.com/en-us/download/details.aspx?id=103477)
• Cumulative Update 10 for Exchange Server 2019 (KB5003612, June 29, 2021, https://www.microsoft.com/en-us/download/details.aspx?id=103241)
• Cumulative Update 9 for Exchange Server 2019 (KB4602570, March 18, 2021, https://www.microsoft.com/en-us/download/details.aspx?id=102900)
• Cumulative Update 8 for Exchange Server 2019 (KB4588885, 12/15/2020 – Cumulative Update 8 for Exchange Server 2019 (microsoft.com)
• Exchange 2019 CU8 Security Update (KB5000871) – Download Security Update For Exchange Server 2019 CU8 (KB5000871) from Official Microsoft Download Center
• Cumulative Update 7 for Exchange Server 2019 (KB4571787, 09/15/2020 – https://support.microsoft.com/en-us/help/4571787/cumulative-update-7-for-exchange-server-2019
• Exchange 2019 CU7 Security Update (KB5000871) – Download Security Update For Exchange Server 2019 CU7 (KB5000871) from Official Microsoft Download Center
• Cumulative Update 6 for Exchange Server 2019 (KB4556415, 06/16/2020) – https://support.microsoft.com/en-us/help/4556415/cumulative-update-6-for-exchange-server-2019
• Exchange 2019 CU6 Security Update (CVE-2020-16969, KB4581424), https://www.microsoft.com/download/details.aspx?familyid=4d941094-0b50-4b33-93ea-d22b4fd38cfd
• Exchange 2019 CU6 Security Update (CVE-2020-16875, KB4577352 ,Included in CU7) – https://www.microsoft.com/en-us/download/details.aspx?id=102012
• Cumulative Update 5 for Exchange Server 2019 (KB4537677, 03/17/2020) – https://support.microsoft.com/en-us/help/4537677/cumulative-update-5-for-exchange-server-2019
• Exchange 2019 CU5 Security Update (CVE-2020-16875, KB4577352) – https://www.microsoft.com/en-us/download/details.aspx?id=102015
• Cumulative Update 4 for Exchange Server 2019 (KB4522149, 12/17/2019) – https://support.microsoft.com/en-us/help/4522149/cumulative-update-4-for-exchange-server-2019
• Cumulative Update 3 for Exchange Server 2019 (KB4514141, 09/17/2019) – https://support.microsoft.com/en-us/help/4514141/cumulative-update-3-for-exchange-server-2019
• Cumulative Update 2 for Exchange Server 2019 (KB4488401, 06/18/2019) – https://support.microsoft.com/en-us/help/4488401/cumulative-update-2-for-exchange-server-2019
• Cumulative Update 1 for Exchange Server 2019 (KB4471391, 02/12/2019) – https://support.microsoft.com/en-us/help/4471391/cumulative-update-1-for-exchange-server-2019

Exchange 2016

Exchange 2016 CU22 (09/24/2021):

• Exchange 2016 CU22 (KB5005333) – https://www.microsoft.com/en-us/download/details.aspx?id=103478
• Exchange 2016 CU22 UM Language Pack – https://www.microsoft.com/en-us/download/details.aspx?id=103479

Exchange 2016 CU21 (06/25/2021):

• Exchange 2016 CU21 (KB5003611) – https://www.microsoft.com/en-us/download/details.aspx?id=103242
• Exchange 2016 CU21 UM Language Pack –https://www.microsoft.com/en-us/download/details.aspx?id=103243
• Security Update for Exchange 2016 CU21 (KB5004779, July 12, 2021, https://www.microsoft.com/en-us/download/details.aspx?id=103311)

Exchange 2016 CU20 (03/16/2021):

• Exchange 2016 CU20 (KB4602569) – https://www.microsoft.com/en-us/download/details.aspx?id=102896
• Exchange 2016 CU20 UM Language Pack – https://www.microsoft.com/en-us/download/details.aspx?id=102897
• Security Update for Exchange 2016 CU20 (KB5001779, April 13, 2021, https://www.microsoft.com/en-us/download/details.aspx?id=103002)

Exchange 2016 CU19 (16/12/2020):

• Exchange 2016 CU19 (KB4588884) – https://www.microsoft.com/en-us/download/details.aspx?id=102532
• Exchange 2016 CU19 UM Language Pack – https://www.microsoft.com/en-us/download/details.aspx?id=102533
• Exchange 2016 CU19 Security Update (KB5000871) – Download Security Update For Exchange Server 2016 CU19 (KB5000871) from Official Microsoft Download Center

Exchange 2016 CU18 (09/16/2020):

• Exchange 2016 CU18 (KB4571788) – https://www.microsoft.com/en-us/download/details.aspx?id=102114
• Exchange 2016 CU18 UM Language Pack – https://www.microsoft.com/en-us/download/details.aspx?id=102115
• Exchange 2016 CU18 Security Update (KB5000871) – Download Security Update For Exchange Server 2016 CU19 (KB5000871) from Official Microsoft Download Center

Exchange 2016 CU17 (06/12/2020):

• Exchange 2016 CU17 (KB4556414) – https://www.microsoft.com/en-us/download/details.aspx?id=101448
• Exchange 2016 CU17 Language Packs (06/12/2020) – https://www.microsoft.com/en-us/download/details.aspx?id=101449
• Exchange 2016 CU17 Security Update (CVE-2020-16875, KB4577352, included in CU18) – https://www.microsoft.com/en-us/download/details.aspx?id=102013
• Exchange 2016 CU17 Security Update (CVE-2020-16969, KB4581424), https://www.microsoft.com/download/details.aspx?familyid=72023316-cf93-4b69-b682-1480feb47034

Exchange 2016 CU16 (03/18/2020):

• Exchange 2016 CU16 (KB4537678) – https://www.microsoft.com/en-us/download/details.aspx?id=101060
• Exchange 2016 CU16 Language Packs (03/18/2020) – https://www.microsoft.com/en-us/download/details.aspx?id=101061
• Exchange 2016 CU16 Security Update (CVE-2020-16875, KB4577352) – https://www.microsoft.com/en-us/download/details.aspx?id=102014

Exchange 2016 CU15 (12/16/2019):

• Exchange 2016 CU15 (KB4522150) – https://www.microsoft.com/en-us/download/details.aspx?id=100780
• Exchange 2016 CU15 Language Packs (01/07/2020) – https://www.microsoft.com/en-us/download/details.aspx?id=100781

Exchange 2016 CU14:

• Exchange 2016 CU14 (KB4522150) – https://www.microsoft.com/en-us/download/details.aspx?id=100780
• Exchange 2016 CU14 Language Packs – https://www.microsoft.com/en-us/download/details.aspx?id=100781

Exchange 2016 CU13:

• Exchange 2016 CU13 (KB44788406) – https://www.microsoft.com/en-us/download/details.aspx?id=58395
• Exchange 2016 CU13 Language Packs – https://www.microsoft.com/en-us/download/details.aspx?id=58393

Exchange 2016 CU12:

• Exchange 2016 CU12 (KB4471392) – https://www.microsoft.com/en-us/download/details.aspx?id=57827
• Exchange 2016 CU12 Language Packs – https://www.microsoft.com/en-us/download/details.aspx?id=57825

Exchange 2016 CU11:

• Exchange 2016 CU11 (KB4134118) – https://www.microsoft.com/en-us/download/details.aspx?id=57388
• Exchange 2016 CU11 UM Language Packs – https://www.microsoft.com/en-us/download/details.aspx?id=57383

Exchange 2016 CU10 and earlier are no longer available from the Microsoft site…

Exchange Server 2013:

Exchange 2013 CU23 (06/18/2019):

• Cumulative Update 23 for Exchange Server 2013 (KB4489622) – https://www.microsoft.com/en-us/download/details.aspx?id=58392
• Exchange Server 2013 CU23 UM Language Packs – https://www.microsoft.com/en-us/download/details.aspx?id=58392
• Security Update for Exchange 2013 CU23 (KB5004778, July 12, 2021, https://www.microsoft.com/en-us/download/details.aspx?id=103312)

Exchange 2013 CU22:

• Cumulative Update 22 for Exchange Server 2013 (KB4345836) – https://www.microsoft.com/en-us/download/details.aspx?id=57826
• Exchange Server 2013 CU22 UM Language Packs – https://www.microsoft.com/en-us/download/details.aspx?id=57828

Exchange 2013 CU21:

• Exchange 2013 CU21 – https://www.microsoft.com/en-us/download/details.aspx?id=57069
• Exchange 2013 CU21 UM Language Packs – https://www.microsoft.com/download/details.aspx?id=57066

Please be advised that Exchange 2013 CU23 is the last Cumulative Update for Exchange 2013. Exchange 2013 entered extended support on April 10th, 2018. Security updates for Exchange 2013 will be released when needed. To receive these security updates, customers are advised to install Exchange 2013 CU23. For more information check the Exchange team blog:
https://blogs.technet.microsoft.com/exchange/2018/04/10/exchange-server-2013-enters-extended-support-lifecycle-phase/

Update. When additional important security fixes are released, Microsoft will release additional Cumulative Updates for Exchange 2013. So, despite end of support of Exchange 2013 you can see newer CU’s become available.

Exchange 2013 CU20:

• Exchange 2013 CU20 – https://www.microsoft.com/en-us/download/details.aspx?id=56717
• Exchange 2013 CU20 UM Language Packs – https://www.microsoft.com/en-us/download/details.aspx?id=56716

Exchange 2013 CU19 and earlier are no longer available from the Microsoft site…

Exchange 2013 SP3 Update Rollups:

• Exchange Server 2010 Service Pack 3 Update Rollup 29 (KB4509410) –https://www.microsoft.com/en-us/download/details.aspx?id=58476
• Exchange Server 2010 Service Pack 3 Update Rollup 28 (KB4503028) –https://www.microsoft.com/en-us/download/details.aspx?id=58354
• Exchange Server 2010 Service Pack 3 Update Rollup 27 (KB4491413) –https://www.microsoft.com/en-us/download/details.aspx?id=58196
• Exchange Server 2010 Service Pack 3 Update Rollup 26 (KB4487052) –https://www.microsoft.com/en-us/download/details.aspx?id=57824
• Exchange Server 2010 Service Pack 3 Update Rollup 25 (KB4468742) –https://www.microsoft.com/en-us/download/details.aspx?id=57759
• Exchange Server 2010 Service Pack 3 Update Rollup 24 (KB4458321) –https://www.microsoft.com/en-us/download/details.aspx?id=57306
• Exchange Server 2010 Service Pack 3 Update Rollup 23 (KB4340733) –https://www.microsoft.com/en-us/download/details.aspx?id=57219
• Exchange Server 2010 Service Pack 3 Update Rollup 22 (KB4295699) – https://www.microsoft.com/en-us/download/details.aspx?id=57065
• Update Rollup 21 For Exchange 2010 SP3 (KB4091243) –
  https://www.microsoft.com/en-us/download/details.aspx?id=56899
• Update Rollup 20 For Exchange 2010 SP3 (KB4073537) – https://www.microsoft.com/en-us/download/details.aspx?id=56659
• Update Rollup 19 For Exchange 2010 SP3 (KB4035162) – https://www.microsoft.com/en-us/download/details.aspx?id=56361
• Update Rollup 18 For Exchange 2010 SP3 (KB4018588) – https://www.microsoft.com/en-us/download/details.aspx?id=55591
• Update Rollup 17 For Exchange 2010 SP3 (KB4011326) – https://www.microsoft.com/en-us/download/details.aspx?id=54934
• Update Rollup 16 For Exchange 2010 SP3 (KB3184730) – https://www.microsoft.com/en-us/download/details.aspx?id=54453
• Update Rollup 15 For Exchange 2010 SP3 (KB3184728) – https://www.microsoft.com/en-us/download/details.aspx?id=53678

Office Web Apps / Office Online Server

Office Web Apps server and Office Online Server are no longer available for public download. They are available from the Microsoft Volume Licensing Service Center (VLSC) under Volume Licensing agreements. If you have a valid license and should be able to use Office Online Server under your license agreement, please contact Microsoft support.

Last update: March 9,  2021