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Why not Office Live? We get Live@Edu free here at the college to host our Student E-Mail. I have no idea what it costs for business, but it's worlds above Google Apps.

Because Google has proven then can provide the service at scale reliably, has an extremely optimized web interface, and provides activesync for email, calendar and contacts.

Read the story about how Google recovered emails from tape when an upgrade went awry. Then look at what happened when the sidekick servers crashed.