Best connectivity to MS Active Directory of any Calendar app

I purchased this application as a replacement for the Outlook Calendar. This app has full connectivity through to Active Directory including room-booking, AD contacts sync and others. I can do real time search/filtering in week or monthly view and even forward events via Mac Mail. I love this app and have recommended it to other team members struggling with Outlook. Fantastic app - you will not be disappointed!

b33rmmm about BusyCal 2, v2.5.4