The GUI (GUI) design is very user-friendly and easy to use by newbies as well as experts alike. It's free version supports up to 250 GB limit size for conversion. You can schedule automatic conversions at any time or set alerts to notify you when an ongoing/ongoing conversion process completes. I like that the "Move" option provides the means to move emails / folders from source folder(s). For example, if your mailbox was migrated from Exchange 2010 server to Office 365, then using this application would allow you to easily migrate all messages & folders from old mailboxes into newly configured ones. There were no problems encountered during our evaluation period. We have been able to successfully utilize this product with ease and minimal hassles. Our organization uses Microsoft Exchange Server and we are dependent upon having access to our Outlook client.