The powerful, full-featured Personal Information Manager for Windows offering Email, Synchronization, Portability, Network support, Android and iOS versions.
Website: https://www.essentialpim.com/pc-version
Download: EssentialPIMPro-7.66.zip – mirror
EssentialPIM Pro is a personal information manager that makes it easy to control your appointments, to do lists, notes, email messages, password entries and contacts. It is an affordable replacement for Outlook. In addition to built-in email support, EssentialPIM Pro offers portability, speed, intuitive interface, and the ability to synchronize all your information with MS Outlook and practically any online service available (Google, iCloud, Toodledo, SyncML, CalDAV, etc.).
7.66 is an very old version (and poor in use compared to the current), that cannot work with a file created in 8.x versions.