Thanks to Henrick Walter for his article “Exchange Schema Versions – Common Questions & Answers”. He describes that you can find your Exchange version by looking to the RangeUpper value in Active Directory Schema (configuration partition).
Unfortunately, I did not find
out how to check the Rollup version for Exchange servers. To check this you may
read Bhargav’s IT Playground blog and its article “How do I check Update
Rollup version on Exchange 20xx Server?” Download the mentioned PowerShell
Script Get-ExchangeUpdateRollups.ps1 and run it! Works fantastically!