Given that for most businesses will see exchange as a central system incremental upgrades are unlikely to be carried out. As a company we are looking at moving from 5.5 to 2003 but that is being treated as a project. An additional elements are more likely to be added in to resolve a specific problem and not just because they have been released.
You do wonder if MS plan to switch to this model so they don't have people wondering when the new version is coming along and can buy themselves more time.
what Microsoft's long-term roadmap for their server products is, or even if they have one. They've just invited me to beta test a service pack for MS Windows server 2003, and it looks like a big one - they aren't accepting any testers who don't have broadband connections.
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