diff --git a/calendar/inc/class.calendar_holiday_report.inc.php b/calendar/inc/class.calendar_holiday_report.inc.php
index fc03b28760..6d9d7148a1 100644
--- a/calendar/inc/class.calendar_holiday_report.inc.php
+++ b/calendar/inc/class.calendar_holiday_report.inc.php
@@ -26,11 +26,11 @@ use EGroupware\Api\Etemplate;
  * days/ or weeks.
  *
  */
-class calendar_holiday_report {
+class calendar_holiday_report extends calendar_ui{
 
 	/**
 	 * Public functions allowed to get called
-	 * 
+	 *
 	 * @var type
 	 */
 	var $public_functions = array(
@@ -42,8 +42,8 @@ class calendar_holiday_report {
 	 */
 	function __construct()
 	{
-		$this->bo = new calendar_bo();
-		$this->tmpl = new Etemplate('calendar.holiday_report');
+		parent::__construct(true);	// call the parent's constructor
+		$this->tmpl = new Api\Etemplate('calendar.holiday_report');
 	}
 
 	/**
@@ -53,9 +53,9 @@ class calendar_holiday_report {
 	 */
 	public function index ($content = null)
 	{
+		$cat = new Api\Categories($GLOBALS['egw_info']['user']['account_id'],'calendar');
 		if (is_null($content))
 		{
-			$cat = new Api\Categories($GLOBALS['egw_info']['user']['account_id'],'calendar');
 			$cats = $cat->return_sorted_array($start=0, false, '', 'ASC', 'cat_name', true, 0, true);
 
 			foreach ($cats as &$value)
@@ -65,15 +65,80 @@ class calendar_holiday_report {
 					'user' => '',
 					'weekend' => '',
 					'holidays' => '',
-					'min_days' => 4
+					'min_days' => 4,
+					'enable' => true
 				);
 			}
 		}
 		else
 		{
+			list($button) = @each($content['button']);
+			$categories = array ();
+			$users_map = $GLOBALS['egw']->accounts->search(array('type'=>'accounts', active=>true));
+			$users = array_keys($users_map);
+			$result = array();
 
+			// report button pressed
+			if (!empty($button))
+			{
+				Api\Preferences::change_preference($content, $name, $value);
+				foreach ($content['grid'] as $row)
+				{
+					if ($row['enable'])
+					{
+						$categories [] = $row['cat_id'];
+					}
+				}
+
+				$params = array(
+					'startdate' => $content['start'],
+					'enddate' => $content['end'],
+					'users' => $users,
+					'cat_id' => $categories
+				);
+				$events = $this->bo->search($params);
+
+				// iterate over found events
+				foreach($events as $event)
+				{
+					$cats = explode(',',$event['category']);
+					if (is_array($cats))
+					{
+						foreach($cats as $val)
+						{
+							if (in_array($val, $categories)) $cat_index = (int)$val;
+						}
+					}
+					$result [$event['owner']]['user_name'] = $users_map[$event['owner']]['account_lid'];
+
+					// number of days of event (in sec)
+					$days = $event['end'] - $event['start'];
+
+					if (isset($result[$event['owner']][$cat->id2name($cat_index)]))
+					{
+						$result[$event['owner']][$cat->id2name($cat_index)] =
+								$result[$event['owner']][$cat->id2name($cat_index)] + $days;
+					}
+					else
+					{
+						$result[$event['owner']][$cat->id2name($cat_index)] = $days;
+					}
+
+				}
+
+				// calculates total days for each user based on cats
+				foreach ($result as &$record)
+				{
+					$total = 0;
+					foreach($record as $c => $value)
+					{
+						if ($c != 'user_name') $total += (int)$value;
+					}
+					$record ['total_days'] = $total;
+				}
+			}
 		}
-
-		$this->tmpl->exec('calendar.holiday_report', $content);
+		$preserv = $content;
+		$this->tmpl->exec('calendar.calendar_holiday_report.index', $content, array(), array(), $preserv, 2);
 	}
 }
diff --git a/calendar/inc/class.calendar_ui.inc.php b/calendar/inc/class.calendar_ui.inc.php
index 355341b9da..5a22bea1fe 100644
--- a/calendar/inc/class.calendar_ui.inc.php
+++ b/calendar/inc/class.calendar_ui.inc.php
@@ -524,7 +524,7 @@ class calendar_ui
 			);
 			$GLOBALS['egw']->framework->sidebox($appname,lang('Admin'),$file,'admin');
 		}
-		display_sidebox('calendar', lang('Utilities'), array('Holiday report' =>  Egw::link('/index.php','menuaction=calendar.calendar_holiday_report.index')));
+		display_sidebox('calendar', lang('Utilities'), array('Holiday report' =>  Egw::link('/index.php','menuaction=calendar.calendar_holiday_report.index&appname=calendar&ajax=true')));
 	}
 
 	/**
diff --git a/calendar/js/app.js b/calendar/js/app.js
index 292aeffba6..583aeea624 100644
--- a/calendar/js/app.js
+++ b/calendar/js/app.js
@@ -247,6 +247,9 @@ app.classes.calendar = (function(){ "use strict"; return AppJS.extend(
 					this.filter_change();
 				},this),0);
 				break;
+			case 'calendar.holiday_report':
+				this.holiday_report_init();
+				break;
 		}
 
 		// Record the templates for the views so we can switch between them
@@ -3736,6 +3739,49 @@ app.classes.calendar = (function(){ "use strict"; return AppJS.extend(
 			d.setUTCDate(d.getUTCDate() + (7 * delta));
 			return d;
 		}
+	},
+
+	/**
+	 * Initialization function in order to set/unset
+	 * categories status.
+	 *
+	 */
+	holiday_report_init: function ()
+	{
+		var content = this.et2.getArrayMgr('content').data;
+		for (var i=0;i<content.grid.length;i++)
+		{
+			if (content.grid[i] != null) this.holiday_report_enable({name:i+'', checked:content.grid[i]['enable']});
+		}
+	},
+
+	/**
+	 * Set/unset selected category's row
+	 *
+	 * @param {type} _widget
+	 * @returns {undefined}
+	 */
+	holiday_report_enable: function (_widget)
+	{
+		var widgets = ['[user]','[weekend]','[holidays]','[min_days]'];
+		var row_id = _widget.name.match(/\d+/);
+		var w = {};
+		for (var i=0;i<widgets.length;i++)
+		{
+			w = this.et2.getWidgetById(row_id+widgets[i]);
+			if (w) w.set_readonly(!_widget.checked);
+		}
+	},
+	/**
+	 *
+	 * @param {type} _widget
+	 * @returns {undefined}
+	 */
+	holiday_report_send: function (_widget)
+	{
+		var content = this.et2.getArrayMgr('content').data;
+		egw.set_preference('calendar','holiday_report',JSON.stringify(content.grid));
+		this.et2._inst.submit(_widget);
 	}
 });}).call(this);
 
diff --git a/calendar/templates/default/holiday_report.xet b/calendar/templates/default/holiday_report.xet
index 599ac3e6f5..e7788f79ce 100644
--- a/calendar/templates/default/holiday_report.xet
+++ b/calendar/templates/default/holiday_report.xet
@@ -30,9 +30,11 @@ Egroupware
 							<column/>
 							<column/>
 							<column/>
+							<column/>
 						</columns>
 						<rows>
 							<row class="th">
+								<description value="Select"/>
 								<description value="Category"/>
 								<description align="center" value="User"/>
 								<description align="center" value="Weekend"/>
@@ -40,8 +42,9 @@ Egroupware
 								<description align="center" value="Min days as week"/>
 							</row>
 							<row class="row">
+								<checkbox id="${row}[enable]" onchange="app.calendar.holiday_report_enable"/>
 								<taglist-cat id="${row}[cat_id]" readonly="true" width="500" class="select-cat"/>
-								<checkbox align="center" id="${row}[user]"/>
+								<checkbox align="center" id="${row}[user]" disable="false"/>
 								<checkbox align="center" id="${row}[weekend]"/>
 								<checkbox align="center" id="${row}[holidays]"/>
 								<number type="integer" align="center" id="${row}[min_days]"/>
@@ -52,10 +55,10 @@ Egroupware
 			</rows>
 		</grid>
 		<hbox class="dialogFooterToolbar">
-			<description value="Range"/>
+			<description value="Date range"/>
 			<date id="start" label="Start"/>
 			<date id="end" label="End"/>
-			<button id="report" label="Report"/>
+			<button id="button[report]" label="Report" background_image="1" image="template" onclick="app.calendar.holiday_report_send" />
 		</hbox>
 	</template>
 </overlay>