Migrate Data
Here's how to import your existing mail, personal contacts, and calendar events to your new Google Apps account.
Import from Microsoft Outlook®
Import data using Google Apps Migration
See what got imported (PDF)
Download Google Apps Migration for Microsoft Outlook® to import your email, personal contacts, and calendar events from your old Outlook profile into Google Apps.
Import from Lotus Notes®
Import personal contacts 
Recreate calendar events 
Import your personal contacts from Lotus Notes using vCards.

Copy over existing events from your old Lotus Notes calendar.
Import from a Mac mail program
Download Email Uploader for Mac
Use the Google Email Uploader for Mac to import your email from Apple Mail, Eudora, Thunderbird, or Entourage (on the Mac).