Right from a discussion internal reflexions (thanks to Ross Smith IV and Brian Day for their help on putting metrics down), here is the final statement.

Based on BES documentation :

We calculated that in summary based on their whitepaper for E2010:

**IO Multiplication Factor: 2.0**

**Megacycle Multiplication Factor 1.5**

Use these factors in your calculations, for example in the Exchange 2010 Storage Calculator.

Sam

Thanks for the information, have these guidelines been updated for Exchange 2013 SP1?

Thanks for the information, have these guidelines been updated for Exchange 2013 SP1?