Google Calendar - Spend less time managing your day & more time enjoying it
Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
Simple Calendar - A simple calendar with events (optional recurring and reminders), week numbers and a customizable...
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Calendar Lock PEA - Calendar Lock PEA is an encrypted desktop calendar with a day, week and month view. The shown calendars are never stored unencrypted on your disk, but exist only in the RAM. Platform-independent, Open Source, no installation or registration required.
Mailbird - Mailbird is the best email client for Windows 7, 8 and 10