SBS 2003 and Windows XP SP2

Hi,
I am managing a small office with about 13 users on an SBS2003 system. We need some help researching what problems may arise when we install SP2 for Windows XP. I have done some research on the net and read most of the microsoft aritcles, but I am sure there are some things they are not saying.

We mainly use Office 2003, Outlook 2003 w/Exchange, and Symantec Corporate Antivirus 9.0.

Any help would be appreciated.

Rob