Microsoft has announced updated servicing models for running Office 365 ProPlus on Windows 10, as well as the support and servicing of the Office 2019 release.
Are you interpreting Microsoft security bulletins for Exchange Server and applying your patching policy the right way?
The Microsoft Exchange team has issued a warning to customers to not install .NET Framework 4.6.1 on Exchange servers.
Microsoft has released Cumulative Update 11 for Exchange Server 2013, including bug fixes and a new behavior for PowerShell management in co-existence scenarios.
Microsoft has released Update Rollup 11 for Exchange Server 2010 Service Pack 3, including bug fixes and co-existence for Exchange Server 2016.