Mail data migration, Core it, Determine which mail migration tool to use – Google Apps Technical Transition Guide For Business, Education, and Government User Manual
Page 31: Chapter 5: mail data migration core it, Determine which mail migration tool to use (p. 31)

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Chapter 5
Mail Data Migration
Chapter 5
Core IT
You don’t migrate any mail data from your legacy system to Google Apps during this
phase. Your company (with the exception of your IT team) continues accessing their
mail exclusively from your legacy mail system.
Determine which mail migration tool to use
Level of Effort:
Low
You should take time during this phase to determine the best mail migration tool for
your transition.
Your recommended migration tool depends on your legacy system. These
recommended tools are server-side applications that require no action from anyone
outside your IT team.
Legacy System
Recommended Tool
Download Page
Documentation
Microsoft
Exchange or an
IMAP server
(e.g., Gmail or
Novell
GroupWise)
Google Apps Migration
for Microsoft Exchange
(GAMME)
Guide
Lotus Notes
Google Apps Migration
for Lotus Notes
(GAMLN)
Guide