Hosted Exchange 2010 is an upcoming trend. We see that more and more of our customers start using it or are looking into it.
For most small and midsize companies, the cost of running an Exchange environment ‘in-house’ is rather high. The implementation costs are high and you need staff to maintain it. This is the main reason why a lot of our customers get interested in Hosted Exchange.
As of product update 250, Synergy can be linked to a ‘Hosted Exchange 2010’ environment. The features available are the same as for linking Synergy to an ‘On premise Exchange 2010’ environment: two-way synchronization of appointments between Synergy and Outlook.
In general you can say that a ‘Hosted Exchange 2010’ environment means that your Exchange 2010 application is not within your own domain, but is hosted by a third party. An ‘On Premise Exchange 2010 environment’ means that you have your own Exchange 2010 application running.
Office 365 also offers Exchange functionality. This part of Office 365 is called Exchange Online. Exchange Online is not supported yet, but we did make all preparations during the development of Hosted Exchange. I expect to be able to support Exchange Online next year.