how to aviod outlook pst file created locally?

I am using postfix as MTA and storing pst file on server. But everytime
there is a network problem (ie. disconnect), outlook will create a new
local pst file(coz it can't find the network path to the pst file).
Because of that i had to manually go to reconfigure the default
delivery to the correct path (after network back on line).

I just want to know if there is a way to aviod outlook to not create a
pst file while user still able to open outlook? Or is there a way to
allow outlook automatically look for the pst on network (when LAN
connection resotre)? Its a pain to manually re-configure the pst
location for every computer...


thanks alot