If you are getting an error on the MobileAdmin utility on SBS2003 that looks much like this:
The remote server returned an error: (403) Forbidden.
Description: An unhandled exception occurred during the execution of the
current web request. Please review the stack trace for more information
about the error and where it originated in the code.
Exception Details: System.Net.WebException: The remote server returned an
error: (403) Forbidden.
You can resolve that by going into the Exadmin virtual directory and unchecking the require secure channel (SSL) box. This will allow the program to function. Thanks to ariproth on Google groups for that one.
Oh, and as I was just about to post this, Susan Bradley pointed me to this, which gives much more detail 
Thanks for this! It worked a treat!
Greg
Thanks a lot! nothing about this in the MS KB
THANK YOU!!!
I have been searching for hours looking for a solution.
Nice one – you’d think the install script would get this working out the box…!