Ever wondered how Exchange Server evolved over the years? And how come Exchange Server 2007 shows "8.0" as its version number?
Here is a brief history of time... it might add a bit to the known history
Mercury - we couldn't get Exchange to scale past 25 users. We were bleeding internally with Xenix mail, so we figured that we'd keep Exchange alive but just use it as a MIR (Microsoft Internal Release). A perf and scale team was put in-place to see what we could do about the abysmal performance.
Touchdown - the perf and scale team figured out the important issues, and Exchange once again had the potential to become an external release, marketed and sold by Microsoft. Indeed, after several test releases, we shipped in early '96 as Exchange 4.0
continue at source
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