Design - Exchange Organization

I would like to know the key points that I need to consider while
designing Exchange. We have at present around 500 users with around 125
heavy users. 250 light users and rest medium users. We would like to go
in for BE/FE configuration. Also, the design should be able to support
upgrading to Exchange 2007. Your input would be highly appreciated.

Regards,
Fazal-Ur Rehman, Shah

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