With the unveiling this week of the iPhone 3G and Version 2.0 of its software, Apple and AT&T have finally begun to make the device a viable enterprise client.

But the iPhone’s sex appeal may not make up for its shortcoming against the BlackBerry smartphones from enterprise powerhouse Research in Motion, and the increasingly capable enterprise devices running Microsoft’s WinMobile platform. Both RIM and Microsoft offer centralized device troubleshooting, administration and management through server-based software.

The new phone, with its 2.0 software, incorporates some key software interfaces for enterprise users and IT departments:

* Cisco’s IPSec VPN client, creating an encrypted connection to corporate networks. 

* Wi-Fi Protected Access 2 (WPA2) Enterprise security specification, with 802.1x authentication.

* Microsoft ActiveSync, creating a two-way, auto-discovery link with Microsoft Exchange-based e-mail systems, with support for automatic push e-mail, and for wiping data from iPhones Full support for Microsoft Office documents.

Click to see: The iPhone 3G is making a play for the enterprise with features that were previously the domain of the BlackBerry smartphone.

How well all these actually work will be critical. Many of them are Apple’s first cut at features and functions that have been staples in the BlackBerry environment for a long time, according to Network World blogger Mitchell Ashley, who says iPhone at present is a pale reflection of what BlackBerry offers business users.

To support the new iPhone, AT&T Wireless recently unveiled a major upgrade to its growing High Speed Packet Access (HSPA) 3G network. The network upgrade is crucial for enterprise users, because it creates an interactive experience closer to what these users expect when accessing enterprise applications on a wireless or even wired corporate LAN.

The AT&T upgrade adds support for HSUPA (high-speed uplink packet access), to support faster upload connections for cellular clients. AT&T says 3G subscribers will see upload speeds of 500Kbps to 1.2Mbps, compared with 500-800Kbps for rivals Verizon Wireless and Sprint Nextel. The iPhone’s exclusive carrier says users will also see download speeds of 700Kbps to 1.7Mbps, compared to its previous speed range of 500Kbps-1.4Mbps. The carrier’s network now covers the top 275 U.S. markets, with another 75 by year-end.

With iPhone 3G, AT&T and Apple are scrapping their original revenue sharing deal – Apple got a cut of the carrier’s monthly service revenue. AT&T says it will offer the iPhone at “attractive prices to broaden the market potential” – subsidies that bring the two new iPhone models down to roughly $200 and $300, depending on memory capacity, with two-year service contracts.