The next version of Kerio, Kerio Connect, has now gone into Beta. The most impressive addition is the ability to have multiple servers, which will help to scale Kerio further both in terms of geography and in terms of total user count. For more on the update:

As Kerio 7 continues to move forward in development, we look forward to seeing how the other new features perform and work with our customers to develop strategies for the newly supported features. If you were thinking about Kerio, but the scalability was a barrier for you in the past, then contact us now and we can work with you to determine if Kerio is a good fit for your organization and if so, develop a strategy for integration!