Portable version of Mozilla Thunderbird. Powerful email client, packed with features.
Free utility that allows you to encode emails.
Software that runs on the taskbar and notifies you of the arrival of new emails.
Add-on for Microsoft Outlook that lets you save messages with a mouse click.

Is it hard to find that email in Outlook? Try this plugin!
Add-in for Microsoft Outlook that facilitates synchronization between Google accounts and Outlook.