Thunderbird

Holds install time in Unix Seconds timestamp

Profiles list - can hold references to other profiles held elsewhere on the device

User Preferences for that profile

Holds list of contacts, emails, and other potentially useful artifacts

Holds last time online login used, last time password changed, hostname, HTTP(s) URL and more

Holds history for Thunderbird - as it contains portions of Firefox embedded, it can be used to visit websites too

Holds all email files with headers, content etc

Holds all email files with headers, content etc

Holds local calendar data

Holds attachments

Holds local address book