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Outlook Web App: Offers three different UI layouts optimized for desktop, tablet, and mobile phone browsers. Ability to customize: Outlook and OWA by integrating apps from the Office marketplace. (Yes, this is a reference to the Agaves add-ins that Microsoft and partners will be making available via the new Office Store.)
Exchange Server 2003 also featured a version of OWA for mobile devices, called Outlook Mobile Access (OMA). Microsoft Exchange Server up to version 5.0 came bundled with Microsoft Exchange Client as the email client. After version 5.0, this was replaced by Microsoft Outlook, bundled as part of Microsoft Office 97 and later.
It enables near-instant seamless mail and calendar integration with your existing exchange server (incoming emails often appear on the Blackberry handset before they appear in the Outlook or OWA clients), which is an advantage over the existing Outlook Web Access model that the Blackberry Internet Service offers.