The best thing about this software is that you can set up multiple accounts to different users in one system without any problems at all. All your mail will be stored safely and it's very easy to access them from anywhere using mobile devices or computers. I have not found anything negative so far about this product as everything was perfect until now. This is my favorite emailing tool. It stores all of our emails and files securely online. We also use it to communicate with other offices and employees who are out of office due to illness or vacation.