I'm a little confused at this point, but trying to keep up as to what IS and ISN'T real at present. I think I have the same requirements as Jeran170, but let me recap to see is matches up. (No, I don't own N900, but really want to)

1) Must have exchange support -- confirmed by Nokia/Maemo
2) Must support multiple calendars -- confirmed by Nokia site (but see #4)
3) Must support multiple emails - confirmed
4) Unknown -- support for multiple calendars from multiple sources without bleed-thru (ala, work is work and private is private)
5) Unknown -- support for multiple contacts from multiple sources without bleed-thru (ala, work is work and private is private)

Can someone clarify further for me?