eWeek: Are Exchange's Competitors Really Pretenders?

"There was a small ruckus created earlier this week when Microsoft's Jeff Ressler said Exchange Server didn't face much of a threat from open-source competitors.

"'We still worry more about Lotus than about the open-source providers, a lot of whom don't have a unified strategy [for trying] to try and address the bigger players in the market. There are interesting things happening with some of them, but they don't come up often in our competitive engagements,' he said..."

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