AF
похоже не страшно, Exchange schema updates are cumulative. Each Cumulative Update (CU) includes all of the changes that were included in previous releases. This means that if you skip a CU, you might still need to apply schema updates even if the CU that you're installing doesn't include its own changes. https://docs.microsoft.com/en-us/Exchange/plan-and-deploy/active-directory/ad-schema-changes?view=exchserver-2016
