jeffrey wrote:

i just installed 2007, and i am thinking that i may want to go back
to 2003 version. has the .pst file changed? can i simply uninstall
outlook 2007 and re-install outlook 2003?

No and yes.

and keep the rest of office 2007?

Yes, but you'll lose some integration features. You won't, for example, be
able to use Word as your mail editor.
--
Brian Tillman