It was very easy to use, I had no problems with it at all! Very simple process that took less than 5 minutes per mailbox. This product does exactly what you need without any frills added in by others who want more money out of your pocket. We were looking forward to using this program but we encountered some issues while trying to migrate our old email inboxes over to new ones as well as moving PST files back up after migrating them. As soon as they fixed those issues everything worked perfectly fine again - which made me happy because my clients are always complaining about their IT not working properly anymore so having these bugs resolved has been great! I like that it can be used with any version of groupwise, as well as exchange 2007/2010. It does not have an option if you want to use older versions than 2013 (which would make sense). Very easy set up process once your done reading documentation. There are some features missing in this product compared to others out there. If you're looking at using kernel to move email between groups then go ahead! You will save time by just having everything in one place rather than copying files back and forth.