Trouble Outlook 2003 and Exchange 2010

I have a client who recently upgraded to Windows SBS 2011, witch has Exchange 2010 built in.

All of there clients are running outlook 2003 and there having issues sharing calanders. Its almost exactly like this issues disscussed here.
http://www.tincupsandstring.com/2010/04/20/exchange-2010-and-outlook-2003-sp3-users/

Now I tried the commands suggested in the Exhcange command shell.

Get-throttlingpolicy |
set-throttlingpolicy -rcamaxconcurrency 32

It the shell asks me for idenitty. There is no mention of this in any of the stuff I have read so far. I am the first to admit I am light on exchange so if anyone could give me a hand I would appricate it.