Exchange Mailbox / Public Folder Size Monitoring

We are in the process of setting up Exchange monitors using OpManager, Build 7205. In setting up our backend servers to be monitored (the servers that house our mailbox stores and public folder stores) I don't see any options for monitoring the size of specific mailboxes or specific public folders. Is this something that the Exchange monitoring add-on provides?

I've tried searching through the OpManager forums regarding mailbox size and public folder size but haven't seen very much on this topic ...

I see that the entire store size per server could be monitored with OpManager, but I need to be able to drill-down and report on those mailboxes / individual public folders that are over a size that I define. For an environment with several hundred mailboxes, this monitoring is a must.

If this is something that OpManager can monitor, please let me know.

Thanks,
Sam