New updates for Exchange Server (September 2025)

Microsoft has released new updates for all supported Exchange Server versions. The September updates do not include security updates, but contain updates for hybrid scenarios. Click here to download the updates directly: The September update is an optional update, so the update is not mandatory, but fixes problems in hybrid operation ... Read more

Exchange Server security updates (August 2025)

Microsoft released new security updates for Exchange Server 2016, 2019 and SE in August. The updates have been available since 12.08., but as I was on vacation, the message appears here late. Click here to download the updates directly: The updates fix the following vulnerabilities, all of which are rated „Important“. Read more

New updates for Exchange Server (May 2025)

Microsoft has released new updates for Exchange Server 2016 and 2019. The May updates do not contain any security-critical updates, but fix problems that have been known in some cases since November 2024. Further information can be found on the Exchange Team Blog. Click here to download the May updates: Here you can find the article on the Exchange Team ... Read more

Exchange Server: 451 5.7.3 Cannot achieve Exchange Server authentication

When migrating or operating multiple Exchange Servers in an organization, problems can occur when sending and receiving emails between the Exchange Servers. One reader had a case where users from one Exchange server could no longer email users on the other Exchange server. The emails remained in the queue ... Read more

Exchange Health Checker: UnifiedContent Auto Cleanup Configured = False

The Exchange Health Checker returns an error if the Exchange Server was not installed in the default path. For example, if the Exchange Server was installed on the D: drive, a path is missing in the configuration for the automatic cleaning of the UnifiedContent directory. The directory then gets bigger and bigger and clutters up the hard disk. This can now be cleaned up automatically. Read more

Exchange 2019: Monitor the maximum size of the database

I had already reported on the 1TB limit for Exchange Server 2019 Standard Server in a previous article. Exchange Server Standard Edition no longer mounts a database above a size of 1 TB. Unfortunately, this is often only noticed when it is too late. For example, if a database reaches the 1TB limit during the normal ... Read more

An error occurred during the installation of assembly: Exchange Update and Windows January Update problems

Here in the forum and on the Exchange Team Blog there are indications that the installation of the November update for Exchange Server 2016 / 2019 may cause problems. It seems that once again there are problems with servers with German or non-English operating systems when the January update for the Windows Server is installed. ... Read more

Exchange Health Checker: Duplicate entry - IANA: Asia/Bishkek

In the Exchange security update of November 2024 there is a bug that causes problems with certain calendar functions and I Exchange Health Checker generates the following error: Microsoft writes the following: Issues occur when Exchange servers process calendar-related information and files such as .ical or .ics attachments You cannot preview the files or view them for ... Read more