How To: get a report on inactive mailboxes and archives (4253603)

In order to receive a number of inactive mailboxes, please go to ODM, Migration, click on Mail and Mailboxes tab. Once there, switch view from List View to Assessment. It'll display the following in Clean Up section:

• The user has not logged on to mailbox for 30 days
• The user has not logged on to mailbox for 90 days
• The user has never logged on to mailbox
• Disabled users with mailbox

Inventory section will display: 

• Mailboxes with archive