I've been looking to migrate from Exchange-Outlook, but there really aren't any options. There just isn't an open source solution to have an integrated email / tasks / events / contacts, with consistent labels across item types and reminders.
With Outlook, i can use a custom view to see every item in a category flagged for follow-up. I can also set a reminder on a contact, or drag an email or contact onto my calendar to create an event.
Thunderbird has it all. I don’t like the way thunderbird does it, but I like outlook even less… so thunderbird it is.
Thunderbird doesn’t do most of this. It uses tags for emails and categories for events. Also, no way to view all items with same category. Can’t drag contact to calendar or task list. Can’t set specific reminder times. …