The 1.3.8166 version of Mailboxes Usage Monitor is provided as a free download on our website. The software relates to Communication Tools. This free software is an intellectual property of Mauro Barresi.
From the developer:
A monitor for mailboxes' quotas and usage. Periodically scans one or more IMAP servers and monitors occupancy and quota. The app is multithreaded and particularly fast
You may want to check out more software, such as Usage Monitor, Printer Usage Monitor or RAS Monitor, which might be related to Mailboxes Usage Monitor.