Out-of-office assistant for admins

The vacation season is just beginning and many colleagues are starting their summer vacation. Unfortunately, they often forget to activate the out-of-office assistant. I have created the "Out of Office Assistant for Admins" so that the Out of Office Assistant does not have to be activated via Exchange Shell, but can be conveniently activated in a small GUI. The small PowerShell script provides a simple GUI for activating the ... Read more

News about Exchange Server 2019 and vNext

Today, Microsoft published a whole series of news about Exchange Server 2019 and the next Exchange Server version. I summarize the most important news in this article. The successor to Exchange 2019 (vNext) was first announced in September 2020 (at MS Ignite). At that time, it was said that the new Exchange version would be released in the second ... Read more

Exchange 2019 CU12: Install administration tools

The CU12 for Exchange 2019 and the CU23 for Exchange 2016 allow only the management tools to be installed on a server or workstation. Especially in a hybrid organization, where all mailboxes have already been migrated to Exchange Online, the last Exchange on-Prem can now be shut down. Before the Exchange Management Tools setup is executed ... Read more

New updates for Exchange Server (April 2022)

Microsoft released new updates for Exchange Server on 20.04.2022. The new updates bring some new features and contain all previously released security updates. Click here to download directly: Exchange Server 2019 Cumulative Update 12 Exchange Server 2016 Cumulative Update 23 With the release of the updates, Microsoft is also changing the way Exchange ... Read more

Exchange Server: New security updates (March 2022)

Microsoft has released new security updates for Exchange Server 2013, 2016 and 2019. The updates can be downloaded here: Exchange Server 2013 CU23 Exchange Server 2016 CU21 and CU22 Exchange Server 2019 CU10 and CU11 The updates close the vulnerability CVE-2022-23277, which is classified as Critical, and the vulnerability CVE-2022-24463, which is classified as Important. As Exchange Server currently likes to ... Read more

New security updates for Exchange Server (January 2022)

Microsoft has released new security updates for Exchange Server 2013, 2016 and 2019. The security update is intended to fix the following three vulnerabilities CVE-2022-21969 (Important) CVE-2022-21855 (Important) CVE-2022-21846 (Critical) The three vulnerabilities mentioned are errors that allow remote code execution. The updates should therefore be installed as soon as possible, even if no exploitation is currently ... Read more

Exchange Server: "The message has been deferred by the categorization agent"

At the turn of the year, there is a problem with mail delivery on Exchange servers. Mails get stuck in the queue with the following message: "The message was put on hold by the categorization agent" Mails are neither sent nor received. This problem has been occurring on all Exchange 2016 / 2019 servers since 01.01.2022 and is caused by the transport agent "Malware Agent" ... Read more

Exchange: Delete old OWA/ECP data

Exchange Server leaves old data or versions of the OWA and ECP directories on the file system after almost every update. In particular, the directory "C:\Program Files\Microsoft\Exchange Server\V15\ClientAccess\Owa\prem" takes up a lot of space on the file system after a long runtime and correspondingly many updates. Here is an example of an Exchange Server that has been running for a while: Old file versions ... Read more

Install Exchange security updates urgently

There are currently still many Exchange servers that have not been provided with the urgently needed security updates. This is not only about the ProxyLogon and ProxyShell vulnerabilities, which were already closed in April by corresponding updates, but now also about the vulnerability CVE-2021-42321, which has been closed with the latest Exchange updates. About the exploitation of ... Read more