error messages displayed

Hello,
I have Outlook 2003 client connecting locally to Exchange Server 2003 SP2.
There are 2 problems, the 1st is when clicking any "mail to: " link from any
website I get the error message "cannot create item". I allready tried to
delete the "frmcache.dat" file. without luck. The 2nd issue is that I also
get another error message after going to "Tools>Options>Other>Advanced
Options>Custom Forms> error message says "The information for Send on Behalf
of could not be displayed. The connection to the Microsoft Exchange Server
is unavailable. Outlook must be online or connected to complete this
transaction." I have completely reinstalled entire outlook 2003 with SP2 and
the same issues still exist. Strange thing is I get all of my email from the
Exchange Server without any problems. What do you suggest. TIA
Joe