Version 2.3 of the Google Apps Migration for Microsoft® Exchange tool is now available with the following improvements:

– Pre-migration diagnostics
Check for configuration errors in connectivity and authentication; and errors in your user list before you run a migration.

– Detailed migration reports

Quickly determine if any message errors occurred during a migration, why those errors occurred, and which users were affected by them.

– IMAP server list
Allows you to choose the specific type of IMAP server from which you are migrating data, which improves performance.

– New command line options:
–emapi_sleep_time — Specifies the interval between two EMAPI requests to throttle the upload
–run_diagnostics — Runs pre-migration diagnostics
–imap_server_type — Specifies the type of IMAP server from which you are migrating data
–noenable_error_reports — Prevents the utility from generating migration reports, which improves performance

– Improved data estimation feature

Feature now uses multi-threading for significantly faster overall data migration estimations.

For more information:
https://www.google.com/support/a/bin/answer.py?hl=en&answer=172212
Release notes: https://www.google.com/support/a/bin/answer.py?hl=en&answer=162794