Yesterday, Microsoft released a new update (CU) for Exchange Server 2019 and Exchange 2016.
Here is an overview of the changes and fixes in the new CU:
The CU 4 for Exchange 2019 can still only be downloaded via VLSC, MSDN (Visual Studio subscription) or Action Pack, so there is no direct download link here. The CU 15 for Exchange 2016 can be downloaded here:
There are a few known problems for both CUs, which can be viewed under the links above. You should therefore follow these instructions before installation. Both CUs require the .NET Framework 4.8, which may need to be installed before the CU.
As always, first check the updates in a test environment and then install them in production.
