The Exchange team is aware of issues with the Windows Operating System updates published July 10th, 2018 causing Exchange to not function correctly. The Windows servicing team has advised us that they will be releasing updates to the affected packages. We encourage Exchange customers to delay applying the July 10th updates, including the security updates released on the same date, on to an Exchange server until the updated packages are available.
Update: July 17th
We wanted to provide you an update on resolving this issue.
The Windows team has removed all bad packages from Windows Update and systems should no longer attempt to download an update which exposes this problem. New updates are being published through Windows Update and should be available for all operating systems by end of day July 17th. The Exchange Team recommends that customers use Windows Update or update the catalogs on their own SUS servers to ensure the latest version of the update is available for installation on your Exchange Servers. Doing so will avoid any possible disruption to the MSExchangeTransport service which was impacted by the July 10th update.
Note: Given the nature of Window Updates, unique KB’s will be offered for each operating system. The Exchange Team recommends using Windows Update to ensure you have the right update for your operating system.