Some new KBs for Tshooting Outlook Calendar Issues

971878 Steps to enable Exchange 2007 store tracing for calendar issues

https://support.microsoft.com/default.aspx?scid=kb;EN-US;971878

 

971435 Steps to enable Exchange 2000 and Exchange 2003 Calendar Store tracing

https://support.microsoft.com/default.aspx?scid=kb;EN-US;971435

970920 Using Process Explorer to List dlls Running Under the Outlook.exe Process

https://support.microsoft.com/default.aspx?scid=kb;EN-US;970920

 

Master Doc (old)  

Working with support to troubleshoot the Outlook calendar in an Exchange environment

https://technet.microsoft.com/en-us/library/cc891495.aspx