webservices.lib load problem

Question

Hi all!
I wrote a application use WWSAPI connect to Exchange server (send mail) and does some things.I wrote this app in windows 7 , and now I want run this app in XP (of course I know WWSAPI doesn't support XP) for others function (not relate to wwsapi library), but this app don't run because I use load static webservices.dll 

#include "webservices.h"
#pragma  comment(lib,"webservices.lib")

And it's crashed. I couldn't dynamic load webservices.dll  because in proxy class use many structs, enums belong to webservice.h

Can anyone tell me how to build this app run in XP without error?

Thanks

Bao Doan