The advantages of Google cloud email are: savings related server builds, email licensing, spam, greater disk space for user inboxes.
There disadvantages to Google email in the cloud are: having to migrate Corporate email to Google cloud, switching DNS servers, Google sync issues (very slow), lost emails, calendars, and contacts to mention a few.
Having Completed a migration, there many challenges, difficulties, and frustrations involved.
One thing to consider when migrating to Google business Apps is mobile Cellular devices. Google Apps connector for Blackberry Enterprise does not work well with Blackberries. Typically mobile users must be migrated to Andriod devices for the solution to work. That being said, good luck if you are considering a move.
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