diff --git a/applets/taskmanager/package/contents/ui/ContextMenu.qml b/applets/taskmanager/package/contents/ui/ContextMenu.qml
--- a/applets/taskmanager/package/contents/ui/ContextMenu.qml
+++ b/applets/taskmanager/package/contents/ui/ContextMenu.qml
@@ -172,6 +172,100 @@
         }
     }
 
+     PlasmaComponents.MenuItem {
+        id: activitiesDesktopsMenuItem
+
+        visible: activityInfo.numberOfRunningActivities > 1
+            && (visualParent && !visualParent.isLauncher
+            && !visualParent.isStartup)
+
+        enabled: visible
+
+        text: i18n("Move To Activity")
+
+        Connections {
+            target: activityInfo
+
+            onNumberOfRunningActivitiesChanged: activitiesDesktopsMenu.refresh()
+        }
+
+        PlasmaComponents.ContextMenu {
+            id: activitiesDesktopsMenu
+
+            visualParent: activitiesDesktopsMenuItem.action
+
+            function refresh() {
+                clearMenuItems();
+
+                if (activityInfo.numberOfRunningActivities <= 1) {
+                    return;
+                }
+
+                var menuItem = menu.newMenuItem(activitiesDesktopsMenu);
+                menuItem.text = i18n("Add To Current Activity");
+                menuItem.enabled = Qt.binding(function() {
+                    return menu.visualParent && menu.visualParent.m.Activities.length > 0 &&
+                           menu.visualParent.m.Activities.indexOf(activityInfo.currentActivity) < 0;
+                });
+                menuItem.clicked.connect(function() {
+                    tasksModel.requestActivities(menu.visualParent.modelIndex(), menu.visualParent.m.Activities.concat(activityInfo.currentActivity));
+                });
+
+                menuItem = menu.newMenuItem(activitiesDesktopsMenu);
+                menuItem.text = i18n("All Activities");
+                menuItem.checkable = true;
+                menuItem.checked = Qt.binding(function() {
+                    return menu.visualParent && menu.visualParent.m.Activities.length === 0;
+                });
+                menuItem.clicked.connect(function() {
+                    var checked = menuItem.checked;
+                    var newActivities = undefined; // will cast to an empty QStringList i.e all activities
+                    if (!checked) {
+                        newActivities = new Array(activityInfo.currentActivity);
+                    }
+                    tasksModel.requestActivities(menu.visualParent.modelIndex(), newActivities);
+                });
+
+                menu.newSeparator(activitiesDesktopsMenu);
+
+                var runningActivities = activityInfo.runningActivities();
+                for (var i = 0; i < runningActivities.length; ++i) {
+                    var activityId = runningActivities[i];
+
+                    menuItem = menu.newMenuItem(activitiesDesktopsMenu);
+                    menuItem.text = activityInfo.activityName(runningActivities[i]);
+                    menuItem.checkable = true;
+                    menuItem.checked = Qt.binding( (function(activityId) {
+                        return function() {
+                            return menu.visualParent && menu.visualParent.m.Activities.indexOf(activityId) >= 0;
+                        };
+                    })(activityId));
+                    menuItem.clicked.connect((function(activityId) {
+                        return function () {
+                            var checked = menuItem.checked;
+                            var newActivities = menu.visualParent.m.Activities;
+                            if (checked) {
+                                newActivities = newActivities.concat(activityId);
+                            } else {
+                                var index = newActivities.indexOf(activityId)
+                                if (index < 0) {
+                                    return;
+                                }
+                                newActivities = newActivities.splice(index, 1);
+                            }
+                            return tasksModel.requestActivities(menu.visualParent.modelIndex(), newActivities);
+                        };
+                    })(activityId));
+                }
+
+                menu.newSeparator(activitiesDesktopsMenu);
+            }
+
+            Component.onCompleted: refresh()
+        }
+    }
+
+
     PlasmaComponents.MenuItem {
         visible: (visualParent && visualParent.m.IsLauncher !== true && visualParent.m.IsStartup !== true)