[tacticalogic]

Buyer knows what he "needs," as opposed to what the business requirements say he needs.

I know what my manager tells me is causing a bottleneck in the organization and needs to be fixed. When does what I "need" to quit getting calls about become a "business requirement"?

[antiRepublicrat]

I know what my manager tells me is causing a bottleneck in the organization and needs to be fixed.

So your actual requirement is to not have that bottleneck, not to have Microsoft's specific solution to that bottleneck as caused by Exchange. It's hard to write neutral requirements when you're vested in one specific technology.