Many of the same costs still apply. Business Continuity, end-user productivity, migration tools, training, etc. We will be releasing more information regarding migrating to Cloud type offerings including Office365. In some cases, small businesses, for example, a cloud offering is difficult to beat simply looking at the numbers. However, just recently, we had an analyst tell us that most companies are either only moving a portion of their workforce to the cloud or pulling a bunch of their employees back to on-premise solutions.
Once you move past the simple cost arguments - you begin to explore the security aspects, the audit, eDiscovery challenges, the 'who owns/accesses' my data questions. The largest obstacle we are finding with many of our customers is that there simply is no 'integration' option in Cloud. If you don't purchase every single solution from the same Cloud provider, you either lose all integration between systems in the cloud or you lose all integration with systems that you keep on-premise with those you deploy in the cloud. By the way - there is no single cloud provider who offers all solutions OR worse - you can only have one cloud provider if you want any integration. We all know how that turns out....cheap at first, then the big invoice comes!
All the gains and efficiencies your organization has achieved go back to zero. Studies are now being published that many mid-to-medium organizations do not see any cost savings or very minimal and the ROI on the migration is seldom realized. Most large organizations can't justify the cost of migration.
Novell believes that a hybrid model will emerge as the best option for those customers who want to explore cloud offerings. A lot of companies have employee populations where cloud/hosted absolutely make sense. They also have populations where cloud/hosted cause more problems than it solves and usually costs more.
Hope that gives you some background and information.