Exchange Server 2019 articles, fixes and updates - Year 2021

This list contains all of the known Microsoft Knowledge Base articles, howtos, fixes, hotfixes, webcasts and updates of Microsoft Exchange Server 2019 that have been released in Year 2021. The list is daily updated.

• 5008720 Outlook and mobile clients don’t authenticate after November 2021 fixes for Windows installed Q5008720 KB5008720 November 15, 2021
• 5005334 Cumulative Update 11 for Exchange Server 2019 (KB5005334) Q5005334 KB5005334 November 12, 2021
• 5007409 Description of the security update for Microsoft Exchange Server 2019, 2016, and 2013: November 9, 2021 (KB5007409) Q5007409 KB5007409 November 10, 2021
• 5007012 Description of the security update for Microsoft Exchange Server 2019 and 2016: October 12, 2021 (KB5007012) Q5007012 KB5007012 October 12, 2021
• 5007065 Setup fails for unattended installation of Exchange Server 2019 CU11 or 2016 CU22 or later Q5007065 KB5007065 September 28, 2021
• 5007044 Start-MailboxAssistant not available in EMS in Exchange Server 2019 (KB5007044) Q5007044 KB5007044 September 28, 2021
• 5007043 Exchange Server SU updates Add/Remove Programs incorrectly (KB5007043) Q5007043 KB5007043 September 28, 2021
• 5007042 Error window appears when you view features in OWA Virtual Directory (KB5007042) Q5007042 KB5007042 September 28, 2021
• 5006999 "401" error and Outlook repeatedly prompts for credentials in Exchange Server 2019 (KB5006999) Q5006999 KB5006999 September 28, 2021
• 5006997 Export-AutoDiscoverConfig exposes admin password and does not work against domain controllers that require signing (KB5006997) Q5006997 KB5006997 September 28, 2021
• 5006996 Korean messages in OWA display "From" as "Start date" after you filter the list in Exchange Server 2019 and 2016 Q5006996 KB5006996 September 28, 2021
• 5006995 Korean email messages display some recipients incorrectly in Exchange Server 2019 and 2016 (KB5006995) Q5006995 KB5006995 September 28, 2021
• 5006994 BCC values not retained in Sent Items in a shared mailbox in Exchange Server 2019 and 2016 (KB5006994) Q5006994 KB5006994 September 28, 2021
• 5006993 Can't log on to OWA in Chrome if SSL is offloaded in Exchange Server 2019 and 2016 (KB5006993) Q5006993 KB5006993 September 28, 2021
• 5006992 No room lists found when trying to add a room in OWA in Exchange Server 2019 or 2016 (KB5006992) Q5006992 KB5006992 September 28, 2021
• 5006991 Mail quota warning messages no longer sent daily in Exchange Server 2019 (KB5006991) Q5006991 KB5006991 September 28, 2021
• 5006990 Exchange CU installation fails after you configure fallback to use default character set (5006990) Q5006990 KB5006990 September 28, 2021
• 5006989 Accepted domains with wildcards for subdomains are not honored when Edge maps AddressSpaces (KB5006989) Q5006989 KB5006989 September 28, 2021
• 5006988 Export of .pst file is unexpectedly triggered again in Exchange Server 2019 and 2016 (KB5006988) Q5006988 KB5006988 September 28, 2021
• 5006986 Opening an Outlook message from the desktop removes line spacing (KB5006986) Q5006986 KB5006986 September 28, 2021
• 5006984 PrepareAD fails if Computers container or RODCs are renamed or moved in Exchange Server 2019 and 2016 (KB5006984) Q5006984 KB5006984 September 28, 2021
• 5006983 Exchange Server 2019 and 2016 certificates created during setup use SHA-1 hash (KB5006983) Q5006983 KB5006983 September 28, 2021
• 5006982 On-premises Exchange queues back up because of incorrect default value (KB5006982) Q5006982 KB5006982 September 28, 2021
• 5006980 Bad signature error using PerfView in Exchange Server 2019 and 2016 (KB5006980) Q5006980 KB5006980 September 28, 2021
• 5003612 Cumulative Update 10 for Exchange Server 2019 (KB5003612) Q5003612 KB5003612 September 2, 2021
• 5005738 Custom attribute changes through EAC are not saved in Exchange 2019 and 2016 Q5005738 KB5005738 August 11, 2021
• 5001874 "500 Unexpected Error" when trying to create a user mailbox in Exchange admin center Q5001874 KB5001874 July 30, 2021
• 5005341 Cannot log in to OWA or ECP after July 2021 SU for Exchange Server 2019, 2016, and 2013 (KB 5005341) Q5005341 KB5005341 July 28, 2021
• 5005319 “Object reference not set to an instance of an object” error and Setup fails in Exchange 2019 CU10 and 2016 CU21 Q5005319 KB5005319 July 20, 2021
• 5004780 Description of the security update for Microsoft Exchange Server 2019: July 13, 2021 (KB5004780) Q5004780 KB5004780 July 16, 2021
• 5004623 Elevation of privilege vulnerability in Active Directory because of "msExchStorageGroup" schema class (KB5004623) Q5004623 KB5004623 June 29, 2021
• 5004619 Mailbox creation through ECP fails after installing Exchange Server 2019 CU9 or 2016 CU20 (KB5004619) Q5004619 KB5004619 June 29, 2021
• 5004618 Start-ManagedFolderAssistant causes a "4999" crash in ELCAssistant.InvokeInternalAssistant with System.NullReferenceException Q5004618 KB5004618 June 29, 2021
• 5004617 TLS 1.2 is not set as default after you install Exchange 2019 with Edge Transport role (KB5004617) Q5004617 KB5004617 June 29, 2021
• 5004616 Changing the email address in EAC doesn't work in modern browsers (KB5004616) Q5004616 KB5004616 June 29, 2021
• 5004615 "InvalidOperationException" and Store Worker process crashes during mailbox move (KB5004615) Q5004615 KB5004615 June 29, 2021
• 5004614 Korean text is garbled in calendar invitation to a user with a Chinese display name (KB5004614) Q5004614 KB5004614 June 29, 2021
• 5004613 OutOfMemory exception when moving a public folder that has a large ICS sync state (KB5004613) Q5004613 KB5004613 June 29, 2021
• 5004612 Message body not displayed in OWA if the message was added in Outlook to a new mailbox (KB5004612) Q5004612 KB5004612 June 29, 2021
• 5003623 "(400) Bad Request" error during Autodiscover for per-user free/busy in a trusted cross-forest topology Q5003623 KB5003623 May 12, 2021
• 5003435 Description of the security update for Microsoft Exchange Server 2019, 2016, and 2013: May 11, 2021 (KB5003435) Q5003435 KB5003435 May 12, 2021
• 4513500 Can't sign in to OWA or EAC after you install Exchange Server 2019 CU2 with AD FS Q4513500 KB4513500 April 19, 2021
• 4569834 Admin search with date string yields unexpected results or no result Q4569834 KB4569834 April 16, 2021
• 4602570 Cumulative Update 9 for Exchange Server 2019 Q4602570 KB4602570 April 2, 2021
• 5001195 UPN specified when creating mailbox is overwritten automatically causing login failures in Exchange Server 2019 and 2016 Q5001195 KB5001195 March 17, 2021
• 5001190 MonitoringGroup can't control the placement of CAS monitoring mailboxes in Exchange Server 2019 and 2016 Q5001190 KB5001190 March 17, 2021
• 5000871 Description of the security update for Microsoft Exchange Server 2019, 2016, and 2013: March 2, 2021 (KB5000871) Q5000871 KB5000871 March 17, 2021
• 5001194 RFC certificate timestamp validation in Exchange Server 2019 and 2016 Q5001194 KB5001194 March 16, 2021
• 5001193 New health mailboxes for databases are created every time Exchange health manager service is restarted Q5001193 KB5001193 March 16, 2021
• 5001192 Microsoft Teams fails to show calendar because Autodiscover v2 isn't site-aware in Exchange Server 2019 and 2016 Q5001192 KB5001192 March 16, 2021
• 5001189 Mailbox Audit log searches and Outlook both tied to MaxHitsForFullTextIndexSearches in Exchange Server 2019 and 2016 Q5001189 KB5001189 March 16, 2021
• 5001188 Incorrect MRM properties stamped on mail item delivery when sending to multiple mailboxes on the same database in Exchange Server 2019 and 2016 Q5001188 KB5001188 March 16, 2021
• 5001186 Encoding of special characters isn't preserved which causes missing text in Outlook in Exchange Server 2019 and 2016 Q5001186 KB5001186 March 16, 2021
• 5001185 EAC has no option to select an archive domain for cloud-based archive in Exchange Server 2019 and 2016 Q5001185 KB5001185 March 16, 2021
• 5001184 EAC has no option to select the correct tenant for an Office 365 mailbox in Exchange Server 2019 and 2016 Q5001184 KB5001184 March 16, 2021
• 5001183 Attachment is treated as bad zip file on Edge Transport server in Exchange Server 2019 and 2016 Q5001183 KB5001183 March 16, 2021
• 5001182 Can't use keyword "TMM" in a special pattern to search email in Exchange Server 2019 Q5001182 KB5001182 March 16, 2021
• 5001181 Certain search scenario can't return expected result in Outlook online mode in Exchange Server 2019 Q5001181 KB5001181 March 16, 2021
• 5000631 Event IDs 1003, 1309 and 4999 are logged after installing Exchange Server 2019 CU8 Q5000631 KB5000631 March 16, 2021
• 4583558 PDF preview function in OWA leads to download action unexpectedly Q4583558 KB4583558 March 16, 2021
• 4602269 Description of the security update for Microsoft Exchange Server 2019 and 2016: February 9, 2021 (KB4602269) Q4602269 KB4602269 February 9, 2021
• 4588885 Cumulative Update 8 for Exchange Server 2019 Q4588885 KB4588885 January 26, 2021
• 4583653 September 2020 update to Exchange Hybrid Configuration Wizard Q4583653 KB4583653 January 26, 2021
• 4602646 Event IDs 1003, 1309 and 4999 are logged after installing Exchange Server 2019 CU8 Q4602646 KB4602646 January 18, 2021
• 4588297 Attachments can’t be downloaded or previewed from Outlook Web App Q4588297 KB4588297 January 15, 2021
• 4583545 Make DomainName in Authserver a multivalued parameter in Exchange Server 2019 and 2016 Q4583545 KB4583545 January 15, 2021
• 4583544 Lots of LDAP requests for FE MAPI w3wp lead to DDoS on DCs in Exchange Server 2019 Q4583544 KB4583544 January 15, 2021
• 4583542 Server assisted search in Outlook doesn't return more than 175 items in Exchange Server 2019 Q4583542 KB4583542 January 15, 2021
• 4583539 Non-breaking space is visible in message body in Outlook in Exchange Server 2019 and 2016 Q4583539 KB4583539 January 15, 2021
• 4583538 Microsoft Teams REST calls exceed the default value of maxQueryStringLength in Exchange Server 2019 and 2016 Q4583538 KB4583538 January 15, 2021
• 4583537 Update Korean word breaker in Exchange Server 2019 and 2016 Q4583537 KB4583537 January 15, 2021
• 4583536 Set-MailboxFolderPermission is included in Mail Recipient Creation in Exchange Server 2019 and 2016 Q4583536 KB4583536 January 15, 2021
• 4583535 New-Moverequest, Resume-Moverequest, and Remove-Moverequest not logged in Audit logs in Exchange Server 2019 and 2016 Q4583535 KB4583535 January 15, 2021
• 4583534 Event ID 65535 System.Runtime.Serialization errors in Application log in Exchange Server 2019 or 2016 Q4583534 KB4583534 January 15, 2021
• 4583533 Exchange Server 2019 or 2016 installation fails with error "The user has insufficient access rights" Q4583533 KB4583533 January 15, 2021
• 4583532 ELC MRM archiving fails due to DomainName in AuthServer in Exchange Server 2019 and 2016 Q4583532 KB4583532 January 15, 2021
• 4583531 Design change about inline images will be forced to download but not open in a new tab of OWA in Exchange Server 2019 and 2016 Q4583531 KB4583531 January 15, 2021
• 4571787 Cumulative Update 7 for Exchange Server 2019 Q4571787 KB4571787 January 15, 2021
• 4559444 Conversion from HTML to RTF removes non-breaking space in Exchange Server 2019 and 2016 Q4559444 KB4559444 January 15, 2021
• 4556415 Cumulative Update 6 for Exchange Server 2019 Q4556415 KB4556415 January 15, 2021
• 4537677 Cumulative Update 5 for Exchange Server 2019 Q4537677 KB4537677 January 15, 2021
• 4522149 Cumulative Update 4 for Exchange Server 2019 Q4522149 KB4522149 January 15, 2021
• 4514141 Cumulative Update 3 for Exchange Server 2019 Q4514141 KB4514141 January 15, 2021
• 4488401 Cumulative Update 2 for Exchange Server 2019 Q4488401 KB4488401 January 15, 2021
• 4593465 Description of the security update for Microsoft Exchange Server 2019 and 2016: December 8, 2020 Q4593465 KB4593465 January 14, 2021
• 4588741 Description of the security update for Microsoft Exchange Server 2019, 2016, and 2013: November 10, 2020 Q4588741 KB4588741 January 14, 2021
• 4581424 Description of the security update for Microsoft Exchange Server 2019, 2016, and 2013: October 13, 2020 Q4581424 KB4581424 January 14, 2021
• 4515832 Description of the security update for Microsoft Exchange Server 2019 and Exchange Server 2016: September 10, 2019 Q4515832 KB4515832 January 14, 2021
• 4503027 Description of the security update for Microsoft Exchange Server 2019 and 2016: June 11, 2019 Q4503027 KB4503027 January 14, 2021
• 4487563 Description of the security update for Microsoft Exchange Server 2019, 2016, and 2013: April 9, 2019 Q4487563 KB4487563 January 14, 2021
• 4471391 Cumulative Update 1 for Exchange Server 2019 Q4471391 KB4471391 January 14, 2021
• 4471389 Description of the security update for Microsoft Exchange Server 2019, 2016, and 2013: January 8, 2019 Q4471389 KB4471389 January 14, 2021