The ease with which you can setup your server, configure various features like replication (both synchronous or asynchronous), backups etc., is really amazing! We used this product for our cloud-based email service provider where we were able to backup thousands of emails per day very efficiently. I think this would have been better if there was an option to set different storage limits for each user account. Also, setting up mailboxes across multiple servers could be done more easily using this software rather than manually creating them one by one. This allowed us to achieve 99.99% uptime during peak business hours without any interruption or downtime.