Got it working. Here is what I know. This issue is a problem most notibly for Palm 700P users who HAVE updated the firmware to verison 1.10. You can find which version you are running by pressing the phone icon on your Treo then the drop down menu icon. From there select "Phone Info". If it is version 1.10 what follows worked for me.
Next go to:
https://ws.palm.com/mypalm/MyPalmGen...tName=TREO700P
And downlaod Version 3.5.4 of VersaMail. Follow its installation instructions.
When that is done. Delete your exchange server email account on your phone. Then create a new account with all the same settings. When that is complete the next resync will take awhile as it brings everything down. But then you will be able to magically have items appear on our Treo Calender after having added them through either your Zimbra web interface or Outlook 2007.
Please note this problem is not a Zimbra issue it is purely a Palm problem.