Posted November 27, 2024Nov 27 FPCH Staff Today we are re-releasing the November 2024 SUs for Exchange Server. The original release of these SUs (released on 11/12/2024) introduced an issue with Exchange Server transport rules stopping after a certain amount of time in some environments. The re-released SUs resolve this issue. To help you understand how to move forward, in this post we use the following naming convention to distinguish between the original November 2024 SU and the re-release: Nov 2024 SUv1: original November 2024 SU (released on 11/12/2024 with article KB5044062) Nov 2024 SUv2: re-released November 2024 SU (released on 11/27/2024 with article KB5049233) The following table describes the actions you need to take based on your environment: If Nov 2024 SUv1… Then… was installed manually and you do not use any transport or DLP rules, it is recommended to install the Nov 2024 SUv2 to gain more granular control over the X-MS-Exchange-P2FromRegexMatch header. Please see the FAQ below. was installed using Microsoft / Windows update and you do not use any transport or DLP rules, in December 2024, the server will download and install the Nov 2024 SUv2. was installed (manually or automatically) and then uninstalled fix the issue with transport rules, install the re-released Nov 2024 SUv2. was never installed, install the re-released Nov 2024 SUv2. Download links are updated in the November 2024 SU announcement blog post. For any additional actions you might need to take after installing the Nov 2024 SUv2, please see the original release blog post. You should always run Exchange Health Checker to see if any additional steps might be needed. FAQs We installed the original Nov 2024 SUv1 manually and had no problems. Do we need to install the Nov 2024 SUv2?Yes. We recommend installing the Nov 2024 SUv2. Please see below for more details. We installed the Nov 2024 SUv1 through Microsoft / Windows Update and had no problems. Will our server install the Nov 2024 SUv2 automatically?Yes. The version number for the Nov 2024 SUv2 package is higher than the version for the Nov 2024 SUv1 release. Servers that get automatic updates from Windows Update will see the Nov 2024 SUv2 available. Please note that we have delayed the release of the Nov 2024 SUv2 to Microsoft / Windows Update until December to prevent servers from automatically installing the Nov 2024 SUv2 over the US Thanksgiving holiday. What are the differences between the Nov 2024 SUv1 and Nov 2024 SUv2 packages?The Nov 2024 SUv2 package resolves the transport rules issue introduced in the Nov 2024 SUv1 package. It also adds more granular control for “Non-RFC compliant P2 FROM header detection.” More details can be found here. The original Nov 2024 SU blog post, applicable CVEs, and our recommended actions post-installation still apply. The Exchange Server Team
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