Today Microsoft released version 8.03.0056 of the Microsoft Exchange Server Profile Analyzer (EPA). You can use EPA to collect (statistical) information from Exchange mailbox stores or an Exchange organization. For instance, you can collection information on user activity and profile statistics for sets of subsets of the mailbox population, which can be used as  input when dimensioning (upgraded) Exchange infrastructure using the Exchange Mailbox Role Calculator (being more specific than the default Light, Average, Heavy and Very Heavy user profiles). The analysis of mailbox servers or organization can also provide input for processes like capacity planning.

Usage of EPA is straightforward, check out this older article on how to use EPA here.

You can download the 32-bit version here or the 64-bit version here.