Assess and Document
An essential step in preparing this type of project is to assess and document the current topology and environment. You must know and review the physical location of the servers, number of users hosted on each mail server, network topology, mail database size, mail routing patterns and sizes and bandwidth limitations order to adequately build a new mail infrastructure.
It is important to identify potential gateway or bridgehead servers, are the servers that will be used for message transfer and directory synchronization between the Lotus Domino and Exchange environments. Any Lotus Domino server that will be functioning as a bridgehead server must be able to can route and receive e-mail from all of the other Lotus Domino servers in your environment.
Determine whether the Lotus Domino servers are dedicated mail servers or if they also host other types of Lotus Notes applications. Lotus Domino mail servers can be retired after the mail migration is completed, but servers that are hosting other types of applications may need to stay in service until those applications are moved to a different platform.
Additionally, keep the following items in mind:
Put together a list of mail-in databases in use and determine how and if they will be implemented in a new environment. This information is available in the Lotus Domino Directory's Mail in Database view.
What rooms and resources are defined and used in Lotus Notes?
List the mail clients in use. Are users accessing their e-mail through Lotus Notes clients, browsers or POP3 e-mail clients? This information will help you determine what clients are necessary in the new messaging environment.
How does SMTP mail currently flow to and from the internet?
This information is invaluable in building a solid plan that will minimize disruption to your users while providing additional functionality beyond their current e-mail capabilities.