The reason to store data on the folder level rather than registry or
file systems is beacause
if some user change his machine or format it's machine all data stored
on registry or file system level are
erased or not available (in case user logged in to other machine and
open Outlook). However when i store
data on folder level, it doesn't matter, cause when user log in to
some machine and configured Outlook to work
against Exchange all data and my data also are syncronized.

What do you think???


Thnask in advance.