Hi Giovanbattista,
using 6.00.6 of pocc here.
Neither PRODUCT_PROFESSIONAL, nor VER_SUITE_WH_SERVER,
is defined here.
That is, because PRODUCT_PROFESSIONAL is new for Windows 7
(aka 6.1.0.0) (then it will be defined in winbase.h), and
VER_SUITE_WH_SERVER seems the same problem (win 5.2).
Pocc is too old ;-)
So I think, you have to define it yourself (#ifndef ... #define ..#endif).
HTH
Lingo