So, after the introduction in part 1, I will start with this subject, which is the most critical of the whole project, because based on the output of this step or phase, your plan and your action and teams will be decided.

System survey and data gathering

For me, the most important tasks that always created issues and troubles in every project, can be resolved by making sure the following items are all known and documented before starting to make the plan:

1. Make sure the domain to be migrated is not registered with Google Apps
2. Confirm the customer has access to the public domain DNS zone, and get the access
3. Internet connection: its stability and available bandwidth
4. Find out if a mail security or anti-spam solution is in use, and email flow route
5. Find out the most important workflows and processes that are related to the email system