Reminderfox works with 64-bit browsers that use Firefox add-ons e.g. Waterfox and Pale Moon. ReminderFox is also available for Thunderbird as an Add-on https://addons.mozilla.org/en-US/thunderbird/addon/reminderfox/?src=search and also available for SeaMonkey as an Add-on https://addons.mozilla.org/en-us/seamonkey/addon/reminderfox/?src=search If you want to support the effort, do not hesitate to make a donation. ReminderFox FAQ Troubleshooting http://www.reminderfox.org/documentation-faq-troubleshooting/#r5 Anybody that thinks their data is gone should post to our Google Group for help. We'll do our very best to help them out. https://groups.google.com/forum/#!forum/reminderfox