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uxbod what the hell does exchange have to do with it.. but to answer you yes it does have interoperability with document management and it has never tried to be an open platform system, but they haven't EoL'd it for 2000 server either and won't till 2010. MS also support exchange on 16 non EOL versions of windows (platforms) to ZCO's 10? versions of linux (platforms).

Can I also point out Microsoft don't need market share like ZCO does to survive and as such have to do less to entice customers. It's moot anyway as it does everything we're talking about.

Using the argument that your opposition doesn't do it so you shouldn't is just bloody stupid and ANY business man would agree. With that kind of attitude we'd never see innovation.