Microsoft is in the process of migrating millions of Hotmail users to the new Outlook.com service.

BBC: Outlook.com screenshot

Microsoft is currently in the process of migrating users from its Windows Live Messenger product to the service.

BBC: Skype graphic

Migrating from Windows to Linux is a much more fiddly process.

ECONOMIST: Face value

Just as with the Linux operating system, which started small with certain workloads, then expanded into large deployments, migrating to the cloud is likely to be an iterative process, with several learning cycles.

FORBES: Red Hat's Formula for an Open Cloud

Migrating the mail system to the cloud is usually the first step to a long transformation process and a new IT paradigm.

FORBES: Can we consider a firm without IT?