Microsoft’s foray into collaboration suite territory appears to be gaining ground. A Microsoft partisan leaked self-serving results from a recent study by Gartner Reports that shows Microsoft Exchange steadily gobbling market share against IBM’s Lotus Domino.

Collaboration Suite Market Share

 
Microsoft Exchange
Lotus Domino
2003 45.5% 47.1%
2004 48% 45.2%
2005 49% 37%

Gartner Reports 2003-2005, via PowerofTheSchwartz

While both sides agree that Lotus has enjoyed steady sales increases, the Lotus camp concedes that Microsoft has gained more.

The reason? According to Lotus manager Ed Brill:

The big picture is that Microsoft is aiming a lot of weaponry at my product’s customers. One thing that’s very interesting is that this firepower is needed at all. If it was obvious on its face that Microsoft had a technically superior solution, they wouldn’t have to invest millions of dollars and an army of people to go after Notes. But all this effort has precious little to show for it, because in most cases, sound business analysis and decision-making wins the day.

Lotus supporters point to a recent survey by Lucid8 that revealed that “a large number of organizations are experiencing disastrous Exchange Server failures.” They sneer at Exchange’s single database storage method, which many experts agree can be hard to protect. And they point to Domino’s clustering and cross-platform capabilities as positive proof that Lotus Domino is bigger and more robust than Exchange.

Friends of Lotus are scratching their heads, wondering why the big pockets at IBM aren’t doing anything to stop the bleeding. Meanwhile, Friends of Microsoft have their own concerns, wondering why on earth Redmond would abandon its largest customer base, Exchange 5.5 users.

We’re guessing that when Microsoft measured Exchange against the many open source alternatives like Sendmail, Postfix, qmail, exim, et al, it didn’t like how Exchange stacked up. Where straight email isn’t a market Microsoft can dominate, it obviously senses that groupware is a market it can.

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