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www.office.com/setup Blogs: A cut over migration is the simplest way to get all your existing email into Office 365. As the name implies, it's a cutover from one service to another. Cutover migrations are supported for Exchange 2003, 2007 and 2010; for organizations with fewer than 1000 mailboxes. The setup and process is straight forward and nothing complicated. With any successful migration, some planning and testing of existing infrastructure is invaluable. Make sure that you plan and test the migration prior to trying to implement. PLANNING Before we can attempt the migration, we need to know what we are going. Microsoft has done a great job of providing good quality information for administrators to use, to plan the migration to Office 365. I always use the Exchange Deployment Assistant as a guide for all my migrations. This site is up to date and will cover most of all the migrations scenarios to Office 365 Open the Exchange Deployment Assistant site Once the site is launched, you are presented three options. Since I am doing a simple cutover migration from Exchange Server 2003, I am going to use the Cloud Only option Click Cloud Only www.office.com/setup Blogs You are now asked a series of questions on end state goals and existing setup www.office.com/setup Answer all the questions Click the next arrow The Exchange Deployment Assistant will generate a step by step guide for you to follow. Make sure to read and understand what you are doing. www.office.com/setup TESTING EXISTING SETUP Using our guide from the Exchange Deployment Assistant, we need to make sure that our Exchange 2003 infrastructure supports RPC over HTTP and Outlook Anywhere. Use the guide to verify the Exchange 2003 setup. Once the setup is verified to be correct, use the Microsoft Remote Connectivity Analyzer to verify RPC over HTTP and Outlook Anywhere. Open the Microsoft Remote Connectivity Analyzer site Select the Outlook Anywhere (RPC over HTTP) test www.of