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Thunderbird Email
Thunderbird is a free, open-source desktop email client that helps users manage their email accounts, calendars, and contacts in one unified interface
since Jun 16, 2026 · HTTP 404
CohortClass of 2026What it is
Thunderbird is a free, open-source desktop email client that helps users manage their email accounts, calendars, and contacts in one unified interface. It supports multiple email protocols and provides features for organizing messages, filtering spam, and securing communications.
HTTP liveness
9 probes since Jun 16Jun 16Jul 13
AliveHard-dead (404/5xx/parked)RedirectedUnverified (timeout/DNS/block)
Observed events
probes · press · GitHub- Jun 16, 2026First probe — downDead · 404
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Pulse Indexobserved activity
9 probes0 pressGitHub –Tranco –
Not enough observed signals for a Pulse Index (needs 2+ signal families).
Cohort survival · Class of 2026weekly
567 products launched in 2026 · 100% still active
567 active0 sunset
Still active
100%
Median lifespan
4.9y