Exchange Server 2019 articles, fixes and updates - letter O

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

• 5037438 Outlook doesn't display unread message icon after installing Exchange Server March 2024 SU Q5037438 KB5037438 April 23, 2024
• 5037172 OwaDeepTestProbe and EacBackEndLogonProbe fail after installing March 2024 SU Q5037172 KB5037172 April 23, 2024
• 5037191 OutsideInModule is disabled after installing Exchange Server March 2024 SU Q5037191 KB5037191 March 12, 2024
• 5035495 OWA displays junk operations even if junk mail reporting is disabled Q5035495 KB5035495 February 16, 2024
• 5035446 OAB shadow distribution fails if legacy authorization is blocked Q5035446 KB5035446 February 16, 2024
• 5028478 OAuth support for Skype for Business Server 2019 Web App Q5028478 KB5028478 June 29, 2023
• 5025312 “Object '<ServerName>' couldn't be found on '<DomainControllerName>'" error when trying to uninstall Exchange Server Q5025312 KB5025312 June 14, 2023
• 5026154 On-Premises Exchange has 35MB file size limit for online archiving Q5026154 KB5026154 May 4, 2023
• 5026151 Oab-Processing-Threshold is set to 0 for On-Premises Q5026151 KB5026151 May 4, 2023
• 5026273 Outlook configuration fails in Android or iOS Q5026273 KB5026273 May 3, 2023
• 5026267 OWA stops responding in an Exchange 2019 and 2016 coexistence topology Q5026267 KB5026267 May 3, 2023
• 5026156 Outlook search fails in a shared On-Premises mailbox if the primary user mailbox is migrated to Exchange Online Q5026156 KB5026156 May 3, 2023
• 5026143 OAB shadow distribution threshold must be reduced or made configurable Q5026143 KB5026143 May 3, 2023
• 5012790 OWA doesn’t remove the "loading" image when a message is opened in Chrome and Edge browsers (KB5012790) Q5012790 KB5012790 April 20, 2022
• 5012773 OWAMailboxPolicy is bypassed and high resolution profile images can be uploaded (KB5012773) Q5012773 KB5012773 April 20, 2022
• 4456247 Outlook meeting reminder won't stay set as "None" in Exchange Server 2019 or 2016 Q4456247 KB4456247 March 11, 2022
• 5008997 OWA redirection doesn't work after installing November 2021 security updates for Exchange Server 2019, 2016, or 2013 Q5008997 KB5008997 January 13, 2022
• 5008720 Outlook and mobile clients don’t authenticate after November 2021 fixes for Windows installed Q5008720 KB5008720 November 15, 2021
• 5006986 Opening an Outlook message from the desktop removes line spacing (KB5006986) Q5006986 KB5006986 September 28, 2021
• 5006982 On-premises Exchange queues back up because of incorrect default value (KB5006982) Q5006982 KB5006982 September 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
• 5004613 OutOfMemory exception when moving a public folder that has a large ICS sync state (KB5004613) Q5004613 KB5004613 June 29, 2021
• 4547712 Outlook on the web (OWA) exposes junk operations even if disabled via OwaMailboxPolicy in Exchange Server 2019 and 2016 Q4547712 KB4547712 January 20, 2021
• 4528689 Outlook on the web shows MailTip when recipients equal the large audience size in Exchange Server 2019 and 2016 Q4528689 KB4528689 January 20, 2021
• 4528688 Only one recipient shows when saving draft by using Exchange ActiveSync version 16.0 in Exchange Server 2019 and 2016 Q4528688 KB4528688 January 20, 2021
• 4488258 OAuth authentication is removed when you save MAPI virtual directory settings in EAC in Exchange Server 2019 and 2016 Q4488258 KB4488258 January 20, 2021
• 4488076 Outlook on the Web can't be loaded when users use an invalid Windows language in Exchange Server 2019 and 2016 Q4488076 KB4488076 October 23, 2020
• 4487602 Outlook for Mac users can still expand a distribution group when hideDLMembership is set to true in Exchange Server 2019 and 2016 Q4487602 KB4487602 February 12, 2019