To download the script, please see attachment to this post.
EDIT 12/30/2016: This post has been updated for the new 2.0 version of the script.
Greetings Exchange Community! My name is Dan Sheehan...
Updated Jul 31, 2020
Version 3.0
Blog Post
What impact does unused mailboxes from ex-employees have on the averages in the script? What about how to calculate the impact on Exchange? In our case, we have about 2500 employees but over 3600 mailboxes. Business policy prevents us from deleting mailboxes
for 7 years after employee leaves. How do we account for the 1100 'unused' but mail-containing mailboxes? (The AD account is disabled, the mailboxes will store old mail, but not log in nor receive anything other than system-wide notices because the unused
mailbox SMTP addresses get changed to 'removedxxxxxxxx@domain.com'. Obviously there's a storage impact, but how to calculate the memory and CPU requirements for such 'abandoned' mailboxes?