Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
Teem - Cloud-based meeting room booking system
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
BOOKMEETINGROOM.COM - Book Meeting Room - Conference & Meeting Rooms Management
Mailbird - Mailbird is the best email client for Windows 7, 8 and 10
MeetingRoomApp - The best meeting and conference room booking system with a number of unique functions for effective meeting management and optimization of company processes.