Google Apps Technical Transition Guide For Business, Education, and Government - Manual (Page 41)

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Chapter 7
Calendar Migration
Chapter 7
Core IT
Decide whether to migrate user calendar data
Level of Effort: Low
You should decide during this phase whether you plan to migrate your users’ legacy
calendar data to Google Apps. Legacy calendar data is often less critical for users
than legacy mail, and you can help simplify your transition by starting fresh with
Google Calendar.
If you decide to migrate user calendar data, you’ll do so while you’re migrating mail
during the next two phases.
Early Adopters
Your early adopters should live on Google Calendar as much as they can during this
phase. Calendar resources that have not been provisioned in Google Calendar must
continue to be booked from your legacy system. Keep in mind that Google Calendar
free/busy information is not visible from your legacy calendar without additional work.
If it’s critical to your early adopters that they see free/busy information in your legacy
system, read
Share free/busy information across systems (optional) (p. 42) for more
information.
Begin provisioning calendar resources (recommended)
Level of Effort: Low