Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
Backblaze - Backblaze's remote backup automatically backs up your data to our secure datacenter.
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
SpiderOak - SpiderOak makes it possible for you to privately store, sync, share & access your data from everywhere.
eM Client - eM Client is a fully-featured email client for Windows and macOS with a clean and easy-to-use interface. eM Client also offers features for calendars, tasks, contacts, notes, and chat.
CrashPlan - CrashPlan for Small Business backup software offers the best way to back up and store business & enterprise data securely - offsite, onsite & online in the Cloud.