Another good case study from our internal IT team has just been published, as they discuss their journey to the Cloud. One of the things they are managing is the hybrid model of some applications/users moving into the Cloud, whilst others stay on premise.
In this case study, they talk about the planning and preparation that's needed when you have a mix of users' mailboxes - some in the Cloud in Office 365 and some in Exchange 2010 on-premise. Their activities involved planning for the dependencies, and staging other implementation projects - for Lync Server 2010 and expansion of ADFS (Active Directory Federation Services) - in order to prepare for implementation.
This will be very similar to projects undertaken within education, where it's typical that students email is moved out to the cloud whilst staff email is kept on-premise (although I've seen cases where university and school staff have then asked for their mailboxes to be moved to the Cloud too, as they're jealous of their students' new inbox capacity and ease-of-access from mobile devices).
Project elements include:
You can read the full case study from our internal IT team here