So we’ve done a test migration, and have our Exchange account forwarding to the new account in Gmail.

Once you’re satisfied, migrate a small group of trusted, possibly techy people, migrate them too.

Once you’re happy all is well, you can begin the migration of everybody else. Once the accounts are created and emails etc are migrated, and all users have forwarding enabled, you can then go through the process of making sure all the groups are set up with correct email addresses and aliases, and also ensure any aliases for users are added as well.

If you have external contacts, especially if they belong to groups, add them too.

If as we had, there are multiple email domains, don’t worry, when you add another, Gmail automatically adds aliases based on existing usernames/email addresses.

Although the migration will add users calendar data, it won’t add things like bookable resources i.e rooms, so you may also need to add these manually, and also manually recreate existing bookings.

Once all users are migrated, you can think about moving your MX records to point at Google.

Details of these settings are here: Gmail MX records

Since DNS records can take anywhere between 24 and 72 hours to replicate, leave the forwarding on on your Exchange users until you’re sure no more email is being delivered. Use the standard Exchange tools to do this.

If you were unable to configure forwarding during the migration, or couldn’t make it work, you may well need to run the migration tool again, to ensure any missing items are synced up to Google.

If you are planning to use Postini, wait until you are happy with Gmail before turning it on, as it comes with problems of it’s own, too numerous for me to detail here.

Now all your users should be able to access Gmail through the web, and have email anywhere.

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