Those who can make you believe absurdities, can make you commit atrocities...
Power is sweet; it is a drug, the desire for which increases with a habit.
Bertrand Russell - 1951

PIM and Contact Management

Essential PIM

Powerful, full-featured email client and organizer for Windows with portability (run it from a USB stick).

Open Contacts

Open Contacts is an address book with CRM features.

Mozilla Sunbird - Portable Edition

Sunbird Portable is a standalone calendaring and task management application.

Note: Development discontinued.