Both Microsoft and IBM are vying for supremacy in the $2.8 billion corporate messaging market which includes collaboration tools such as e-mail, Web publishing, electronic calendars and project management systems.
To encourage customers to switch from their existing Lotus applications to Microsoft's platform, Microsoft said it would offer a tool to allow potential customers to identify and organize its most-used shared software.
In market share terms, Microsoft had 32 percent of the 389 million users of e-mail and collaboration software, while IBM had around 24 percent, Radicati estimated.
By 2009, Radicati estimates that the number of Microsoft Exchange users will rise to 200 million users, or 37 percent of the corporate market.
IBM Domino/Notes users will sink to 68 million, or 13 percent of the market, while IBM's new Workplace software will grow to 35 million users, or 6.5 percent of the market, meaning IBM's total share will amount to around 20 percent of the global market.
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