After adding the Inactive Mailboxes At A Glance to the Corporate Exchange At A Glance webpage you see the following.
Inactive Mailboxes At A Glance
Statement of the number of mailboxes and the number inactive as observed during the period.
On (Today's Date), MessageStats has gathered information from a total of 2,681 mailboxes in the organization, of which 2,681 are Inactive.
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This is because the information in this report comes form the Exchange tracking logs and Messagestats is not able to collect today's tracking logs. Only yesterday and\or previous days.
Currently there is no workaround for this issue.
A defect has been logged.
TF00120409