diff --git a/qga/commands-win32.c b/qga/commands-win32.c
index 7e8ecb3..1ed9fc1 100644
--- a/qga/commands-win32.c
+++ b/qga/commands-win32.c
@@ -15,6 +15,7 @@
 #include <wtypes.h>
 #include <powrprof.h>
 #include "qga/guest-agent-core.h"
+#include "qga/vss-win32-requester.h"
 #include "qga-qmp-commands.h"
 #include "qapi/qmp/qerror.h"
 
@@ -145,34 +146,95 @@ void qmp_guest_file_flush(int64_t handle, Error **err)
     error_set(err, QERR_UNSUPPORTED);
 }
 
+#ifdef HAS_VSS_SDK
+
 /*
  * Return status of freeze/thaw
  */
 GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **err)
 {
-    error_set(err, QERR_UNSUPPORTED);
-    return 0;
+    if (!vss_initialized()) {
+        error_set(err, QERR_UNSUPPORTED);
+        return 0;
+    }
+
+    if (ga_is_frozen(ga_state)) {
+        return GUEST_FSFREEZE_STATUS_FROZEN;
+    }
+
+    return GUEST_FSFREEZE_STATUS_THAWED;
 }
 
 /*
- * Walk list of mounted file systems in the guest, and freeze the ones which
- * are real local file systems.
+ * Freeze local file systems using Volume Shadow-copy Service.
+ * The frozen state is limited for up to 10 seconds by VSS.
  */
 int64_t qmp_guest_fsfreeze_freeze(Error **err)
 {
-    error_set(err, QERR_UNSUPPORTED);
+    int i;
+
+    slog("guest-fsfreeze called");
+
+    if (!vss_initialized()) {
+        error_set(err, QERR_UNSUPPORTED);
+        return 0;
+    }
+
+    /* cannot risk guest agent blocking itself on a write in this state */
+    ga_set_frozen(ga_state);
+
+    qga_vss_fsfreeze_freeze(&i, err);
+    if (error_is_set(err)) {
+        goto error;
+    }
+
+    return i;
+
+error:
+    qmp_guest_fsfreeze_thaw(NULL);
     return 0;
 }
 
 /*
- * Walk list of frozen file systems in the guest, and thaw them.
+ * Thaw local file systems using Volume Shadow-copy Service.
  */
 int64_t qmp_guest_fsfreeze_thaw(Error **err)
 {
+    int i;
+
+    if (!vss_initialized()) {
+        error_set(err, QERR_UNSUPPORTED);
+        return 0;
+    }
+
+    qga_vss_fsfreeze_thaw(&i, err);
+
+    ga_unset_frozen(ga_state);
+    return i;
+}
+
+#else
+
+GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **err)
+{
+    error_set(err, QERR_UNSUPPORTED);
+    return 0;
+}
+
+int64_t qmp_guest_fsfreeze_freeze(Error **err)
+{
+    error_set(err, QERR_UNSUPPORTED);
+    return 0;
+}
+
+int64_t qmp_guest_fsfreeze_thaw(Error **err)
+{
     error_set(err, QERR_UNSUPPORTED);
     return 0;
 }
 
+#endif
+
 /*
  * Walk list of mounted file systems in the guest, and discard unused
  * areas.
diff --git a/qga/main.c b/qga/main.c
index db281a5..423d41b 100644
--- a/qga/main.c
+++ b/qga/main.c
@@ -32,6 +32,10 @@
 #include "qga/channel.h"
 #ifdef _WIN32
 #include "qga/service-win32.h"
+#ifdef HAS_VSS_SDK
+#include "qga/vss-win32-provider.h"
+#include "qga/vss-win32-requester.h"
+#endif
 #include <windows.h>
 #endif
 #ifdef __linux__
@@ -675,6 +679,25 @@ static gboolean channel_init(GAState *s, const gchar *method, const gchar *path)
 }
 
 #ifdef _WIN32
+
+static gboolean vss_win32_init(void)
+{
+#ifdef HAS_VSS_SDK
+    if (FAILED(vss_init())) {
+        g_critical("failed to initialize VSS");
+        return false;
+    }
+#endif
+    return true;
+}
+
+static void vss_win32_deinit(void)
+{
+#ifdef HAS_VSS_SDK
+    vss_deinit();
+#endif
+}
+
 DWORD WINAPI service_ctrl_handler(DWORD ctrl, DWORD type, LPVOID data,
                                   LPVOID ctx)
 {
@@ -717,8 +740,12 @@ VOID WINAPI service_main(DWORD argc, TCHAR *argv[])
     service->status.dwWaitHint = 0;
     SetServiceStatus(service->status_handle, &service->status);
 
+    if (!vss_win32_init()) {
+        goto out_bad;
+    }
     g_main_loop_run(ga_state->main_loop);
-
+    vss_win32_deinit();
+out_bad:
     service->status.dwCurrentState = SERVICE_STOPPED;
     SetServiceStatus(service->status_handle, &service->status);
 }
@@ -943,7 +970,11 @@ int main(int argc, char **argv)
             { (char *)QGA_SERVICE_NAME, service_main }, { NULL, NULL } };
         StartServiceCtrlDispatcher(service_table);
     } else {
+        if (!vss_win32_init()) {
+            goto out_bad;
+        }
         g_main_loop_run(ga_state->main_loop);
+        vss_win32_deinit();
     }
 #endif