The best thing about this product it that its very easy to configure with your existing mail servers, also that you can make use of all features in both windows & linux platforms, so no worries regarding compatibility issues. This software has been recently updated which i feel gives us more options for user interface enhancement as well. I would say there are some minor glitches while configuring the firewall settings but nothing serious enough to dislike the product. If you're looking for an integrated solution then go ahead and give this a try, also if you have any queries please do reach out to their support team they will surely help you out! We used to receive around 200k emails per day from clients spread across different timezones & locations. With surgemail we reduced our setup cost by 50% compared to other services like G suite or outlook web access (OWA). And most importantly its free forever.