CHALLENGE Agrei Consulting came into the migration project with a directive to migrate a number of subsidiaries across more than a half dozen mail platforms within six months. The subsidiaries used a wide variety of email systems, including Exchange on-prem, Lotus, Google, hosted Exchange, Zimbra, among others. One subsidiary had all its 40,000 mailboxes on Google. Because Agrei had come to the project when it was already in progress, tim

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