Manual

16 Google Apps Migration for Microsoft
®
Exchange Administration Guide
4. The utility transforms email data to MIME. (Microsoft Outlook® is required only if you are
migrating from Microsoft
®
Exchange Server or PST files.)
5. The utility makes a WinHTTP connection to Google Apps.
Using 2-legged OAuth, the utility logs in to the users’ Google Apps accounts, and writes
the transformed message-store data to each user’s account.
Email is processed at a maximum rate of one message per second per user, assuming
that no latency is introduced by mail server or network performance. For example, if you
configure the utility to process 25 users at a time (spawn 25 simultaneous threads), then
at most 25 messages are processed every second.
Note: For customers running a hosted Exchange or IMAP solution that is not located on the
same LAN as the GAMME client, the rate of migration can be significantly impacted
based on the network latency to and from the hosted mail server.
The original message headers are preserved. Duplicate messages are filtered out based
on subject and body.
Calendar and contact data are processed according to the speed at which your network
connects to external networks.
Data is processed from newest to oldest.
Deployment scenarios
This section covers:
• Running a pilot migration
• Examples of the topological approaches you can take to setting up client machines
between your mail server infrastructure and Google Apps, and information about the
parallel processing of users on those client machines
Running a pilot migration
When you are ready to migrate your users, you can first migrate a pilot group to get an idea of
how quickly the process completes.
For example, you can choose 25 users, make a note of the sizes of their mailbox stores, and
then migrate just those users. After the test migration has completed, you can consult the log
files to see the start and end times for each test user, and extrapolate from that an estimate of
how long it will take to migrate all your users’ data.
Using a pilot group also allows you to test the whole process of migrating data and then
working with mail, calendar, and contacts in the new Gmail environment. Any technical or
communication issues you encounter with a small group are more easily managed and
rectified, and with that experience you can provide a smoother transition for the rest of your
users.