KB5042461: Cumulative Update 15 Exchange Server 2019

KB5042461: Cumulative Update 15 Exchange Server 2019

Features introduced in this update

• Support for Windows Server 2025
• Partial TLS 1.3 support for Exchange Server 2019
• Certificate management tasks restored to EAC
• Feature Flighting in Exchange Server​​​​​​​
• OIT module in Exchange Server is replaced by DocParser

Issues that this cumulative update fixes
This cumulative update also fixes the issues that are described in the following Microsoft Knowledge Base articles:

• 5047359 Clean up old Exchange OWA files automatically to free up disk space
• 5047361 Inline images and text attachments are not visible in OWA
• 5047402 Online Archiving bypasses the InternetWebProxy setting in Exchange 2019
• 5047995 MFNs are not sent to remote domains
• 5047997 Wrong server version displayed in POP and IMAP logoff strings
• 5048017 RecoverServer operation fails in Exchange Server 2019
• 5048019 "NullReferenceException" error and Managed Store stops responding
• 5048020 Calendar print doesn't work in OWA from Exchange 2019 CU14 onwards
• 5048021 HTML message is corrupted if is included
• 5048072 "Enabled Extended Protection" message when you run setup with prepare*​​​​​​​ command
• 5047994 German umlauts in the Subject are replaced by a question mark
• 5047358 Group Metrics generation doesn't finish in multidomain environment

Known issues in this cumulative update

• The Edge Transport service (EdgeTransport.exe) stops responding and then restarts. For more information and a workaround, see Edge Transport service stops responding after installing November 2024 SU or Exchange 2019 CU15.