The document discusses alternatives to Exchange and BlackBerry Enterprise Server (BES) for smartphone hosting. It introduces MailSite Fusion and MailSite BlackBerry ActiveSync Client as solutions that provide business-class messaging features without requiring Exchange or BES. MailSite Fusion can replace Exchange, provide full mobile support via ActiveSync, and has lower total cost of ownership than Exchange. The MailSite BlackBerry client allows BlackBerry devices to sync with MailSite Fusion or Exchange without needing BES.
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