The Exchange Server Role Requirements Calculator which you need for designing a proper Exchange 2013 or Exchange 2016 on-premises environment has been updates, currently the calculator is at version 8.4.

Some new functionality is added to this version:

• Added support for ReplayLagMaxDelay
• Added support for SafetyNetHoldTime in CreateDAG.ps1

And seven bug fixes in this version:

• Improved the DAG auto-calculation results display to highlight deployment configuration in both datacenters
• Fixed an issue that prevented DAG auto-calculation in single site DAG deployments
• Fixed a SPECInt2006 validation issue with DAG auto-calculation
• Fixed a bug with the DAG auto-calculation with Active/Passive deployments
• Fixed conditional formatting issues with the transaction log table
• Removed data validation from certain unused cells on the Input tab
• Fixed bug in calcNumActiveDBsSF formula

The requirements calculator can be downloaded here: https://gallery.technet.microsoft.com/Exchange-2013-Server-Role-f8a61780

More information:

• Released: Exchange 2013 Server Role Requirements Calculator – https://blogs.technet.microsoft.com/exchange/2013/05/14/released-exchange-2013-server-role-requirements-calculator/
• Exchange Server Role Requirements Calculator Release Notes – https://blogs.technet.microsoft.com/exchange/2013/05/24/exchange-2013-server-role-requirements-calculator-release-notes/
• Exchange Server Role Requirements Calculator Readme – https://gallery.technet.microsoft.com/Exchange-2013-Server-Role-c81ac1cf