Hello everyone!
With the Customer Driven Upgrade (CDU) window open for Microsoft Dynamics CRM Online 2015 Update 1, also referred to as the Spring 2015 upgrade, we thought it would be a good idea to post some information that will be useful to help you and your customers be successful with this upgrade.
First, the Getting Ready for the Next Release page on the CRM Customer Center is a great resource which describes in detail the new features and changes in this update, as well as resources around planning the upgrade process.
For a more detailed look at the CDU process, this article on TechNet provides very detailed steps on managing the upgrade process, including screenshots, broken down by the version they are upgrading from. There is also detail about the requirements for upgrading posted on TechNet, and that can be viewed on this page.
I'd also like to provide a reminder that Trial and Demo environments do not go through the CDU process. If you'd like to see the new features and updates on one of those offers, you would need to provision a new Trial or Demo. Those will automatically provision using the latest updates.
I hope that these resources will help provide you and your customers a smooth experience as you update through the CDU process.