Global go live, Provision remaining calendar resources, Finish migrating user calendar data (optional) – Google Apps Technical Transition Guide For Business, Education, and Government User Manual
Page 43: Provision remaining calendar resources (p. 43)

Calendar Migration
43
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If you’re migrating from Lotus Notes, download and install
.
Note:
These calendar connectors are not intended as a permanent solution for
maintaining two coexisting calendar systems. As soon as all of your users are
living on Google Calendar, they should stop using your legacy calendar
system.
Global Go Live
Provision remaining calendar resources
Level of Effort:
Moderate
Now that all of your employees are beginning to live on Google Apps, you should
provision all calendar resources in Google Apps that you didn’t provision during the
Early Adopters phase.
Finish migrating user calendar data (optional)
Level of Effort:
Moderate
If you’ve decided to migrate your users’ calendar data, you should finish migrating any
calendar data that you didn’t migrate during the Early Adopters phase.