error LNK2001: unresolved external symbol IID_IPOutlookApp2

hi all,
I am trying to access windows mobile phonebook in my application but i am getting following error:
Error 13 error LNK2001: unresolved external symbol IID_IPOutlookApp2 phonebook.obj
Error 14 error LNK2001: unresolved external symbol CLSID_Application phonebook.obj


what can be reason?
I already have included #include <pimstore.h> and have added pimstore.lib , but still have the same problem.

thanks ,
rohit

Could something from this help you?