Hierarchy or Flat Global Address List

Hello,

Most Exchange 5.5 implementations I've seen have this flat Global Address List, but today I've been asked for eliminating a hierarchy (you know Finance then Accounting, etc) in this Global Address List, therefore leaving it flat.

For my surprise it can't be done clicking and dragging, so my questions are:

1. what are the difference between having flat or with a hierarchy? pros and cons, and

2. the most important how can I delete all this hierarchy and leave it flat?

Please your comments and help will be very much appreciated,

Juan Fernando Salazar
jsalazar@skychile.cl