diff --git a/reactos/include/psdk/commctrl.h b/reactos/include/psdk/commctrl.h
index a6563982eaa..591b8374248 100644
--- a/reactos/include/psdk/commctrl.h
+++ b/reactos/include/psdk/commctrl.h
@@ -4012,10 +4012,16 @@ typedef struct {
 #define MonthCal_SetMonthDelta(hmc,n) (int)SNDMSG(hmc,MCM_SETMONTHDELTA,n,0)
 #define MCM_GETMAXTODAYWIDTH (MCM_FIRST+21)
 #define MonthCal_GetMaxTodayWidth(hmc) (DWORD)SNDMSG(hmc,MCM_GETMAXTODAYWIDTH,0,0)
+#define MCM_GETCURRENTVIEW (MCM_FIRST + 22)
+#define MonthCal_GetCurrentView(hmc) (DWORD)SNDMSG(hmc, MCM_GETCURRENTVIEW, 0, 0)
+#define MCM_GETCALENDARCOUNT (MCM_FIRST + 23)
+#define MonthCal_GetCalendarCount(hmc) (DWORD)SNDMSG(hmc, MCM_GETCALENDARCOUNT, 0, 0)
 #define MCM_SETUNICODEFORMAT CCM_SETUNICODEFORMAT
 #define MonthCal_SetUnicodeFormat(hwnd,fUnicode) (WINBOOL)SNDMSG((hwnd),MCM_SETUNICODEFORMAT,(WPARAM)(fUnicode),0)
 #define MCM_GETUNICODEFORMAT CCM_GETUNICODEFORMAT
 #define MonthCal_GetUnicodeFormat(hwnd) (WINBOOL)SNDMSG((hwnd),MCM_GETUNICODEFORMAT,0,0)
+#define MCM_SIZERECTTOMIN (MCM_FIRST + 29)
+#define MonthCal_SizeRectToMin(hmc, prc) SNDMSG(hmc, MCM_SIZERECTTOMIN, 0, (LPARAM)(prc))
 #define MCM_SETCALENDARBORDER (MCM_FIRST + 30)
 #define MCM_GETCALENDARBORDER (MCM_FIRST + 31)
 
diff --git a/reactos/include/psdk/prsht.h b/reactos/include/psdk/prsht.h
index dc1b1afedac..b68f0bc127f 100644
--- a/reactos/include/psdk/prsht.h
+++ b/reactos/include/psdk/prsht.h
@@ -192,8 +192,13 @@ typedef struct _PROPSHEETPAGEA {
 	LPCSTR pszHeaderTitle;
 	LPCSTR pszHeaderSubTitle;
 #endif
-} PROPSHEETPAGEA,*LPPROPSHEETPAGEA;
-typedef const PROPSHEETPAGEA *LPCPROPSHEETPAGEA;
+} PROPSHEETPAGEA,*LPPROPSHEETPAGEA,
+  PROPSHEETPAGEA_LATEST, *LPPROPSHEETPAGEA_LATEST;
+typedef const PROPSHEETPAGEA *LPCPROPSHEETPAGEA, *LPCPROPSHEETPAGEA_LATEST;
+#define PROPSHEETPAGEA_V1_SIZE CCSIZEOF_STRUCT(PROPSHEETPAGEA, pcRefParent)
+#define PROPSHEETPAGEA_V2_SIZE CCSIZEOF_STRUCT(PROPSHEETPAGEA, pszHeaderSubTitle)
+#define PROPSHEETPAGEA_V3_SIZE CCSIZEOF_STRUCT(PROPSHEETPAGEA, hActCtx)
+#define PROPSHEETPAGEA_V4_SIZE sizeof(PROPSHEETPAGEA)
 typedef struct _PROPSHEETPAGEW {
 	DWORD	dwSize;
 	DWORD	dwFlags;
@@ -215,8 +220,13 @@ typedef struct _PROPSHEETPAGEW {
 	LPCWSTR pszHeaderTitle;
 	LPCWSTR pszHeaderSubTitle;
 #endif
-} PROPSHEETPAGEW,*LPPROPSHEETPAGEW;
-typedef const PROPSHEETPAGEW *LPCPROPSHEETPAGEW;
+} PROPSHEETPAGEW,*LPPROPSHEETPAGEW,
+  PROPSHEETPAGEW_LATEST, *LPPROPSHEETPAGEW_LATEST;
+typedef const PROPSHEETPAGEW *LPCPROPSHEETPAGEW, *LPCPROPSHEETPAGEW_LATEST;
+#define PROPSHEETPAGEW_V1_SIZE CCSIZEOF_STRUCT(PROPSHEETPAGEW, pcRefParent)
+#define PROPSHEETPAGEW_V2_SIZE CCSIZEOF_STRUCT(PROPSHEETPAGEW, pszHeaderSubTitle)
+#define PROPSHEETPAGEW_V3_SIZE CCSIZEOF_STRUCT(PROPSHEETPAGEW, hActCtx)
+#define PROPSHEETPAGEW_V4_SIZE sizeof(PROPSHEETPAGEW)
 typedef UINT(CALLBACK *LPFNPSPCALLBACKA)(HWND,UINT,LPPROPSHEETPAGEA);
 typedef UINT(CALLBACK *LPFNPSPCALLBACKW)(HWND,UINT,LPPROPSHEETPAGEW);
 typedef int(CALLBACK *PFNPROPSHEETCALLBACK)(HWND,UINT,LPARAM);
@@ -257,6 +267,8 @@ typedef struct _PROPSHEETHEADERA {
 #endif
 } PROPSHEETHEADERA,*LPPROPSHEETHEADERA;
 typedef const PROPSHEETHEADERA *LPCPROPSHEETHEADERA;
+#define PROPSHEETHEADERA_V1_SIZE CCSIZEOF_STRUCT(PROPSHEETHEADERA, pfnCallback)
+#define PROPSHEETHEADERA_V2_SIZE sizeof(PROPSHEETHEADERA)
 typedef struct _PROPSHEETHEADERW {
 	DWORD	dwSize;
 	DWORD	dwFlags;
@@ -290,6 +302,8 @@ typedef struct _PROPSHEETHEADERW {
 #endif
 } PROPSHEETHEADERW,*LPPROPSHEETHEADERW;
 typedef const PROPSHEETHEADERW *LPCPROPSHEETHEADERW;
+#define PROPSHEETHEADERW_V1_SIZE CCSIZEOF_STRUCT(PROPSHEETHEADERW, pfnCallback)
+#define PROPSHEETHEADERW_V2_SIZE sizeof(PROPSHEETHEADERW)
 typedef BOOL(CALLBACK *LPFNADDPROPSHEETPAGE)(HPROPSHEETPAGE,LPARAM);
 typedef BOOL(CALLBACK *LPFNADDPROPSHEETPAGES)(LPVOID,LPFNADDPROPSHEETPAGE,LPARAM);
 typedef struct _PSHNOTIFY {