again thanks for your respond.
It looks that I wasn't completely clear. I think that I have 2 accounts in Vista, 1 email account specified in Outlook and 2 profiles in Outlook respectively. Settings for Outlook are the same i.e. it's default except they use 2 different PST files. And the problem is that I can't add second PST file (either her or mine) .. it fails to open the second PST.
As you recommended I changed the setting for server and now mail isn't deleted from server for 10 days. Now I can see the same message using my wife and mine account and 2 different profiles respectively. That's good but it wasn't my goal. Actually I don't think it's good idea to save messages on server and also it won't work if one of us open his/her mail client after 10 days. The goal was to see the same messages using either of profiles.
Thanks again for your kindly response.