Thunderbird Desktop — Monthly Engineering Support Summary
August 2026 vs July 2026
For engineering: the support signals worth investigating this month vs last — flagged incidents, moving cause clusters, and release adoption. (Community/support-ops KPIs — answered & solved rates, response time — are a separate upcoming report.) Non-AI: regex + traditional stats.
⚠️ August 2026 is in progress — data through day 30 of 31. Counts are partial, so the deltas below understate August 2026; treat volume changes as directional until the month closes.
Headline
| July 2026 | August 2026 | Change | |
|---|---|---|---|
| Support questions (load) | 731 | 880 | ▲ +149 (+20%) |
| Version × cause spikes flagged | 0 | 4 | ▲ +4 |
| — of which new regressions | 0 | 0 | ▬ 0 |
| Cause-level surges flagged | 0 | 0 | ▬ 0 |
🚨 Incidents to investigate
⏱ Reading spike timing: a spike dates when users piled in — a lagging signal, usually days after an incident’s onset and often near its resolution (e.g. the Jun 2023 Libero outage began ~Jun 14; the questions spiked Jun 19). Treat these as pain-cluster / triage signals, not real-time incident detection.
Version × cause — possible release regressions
Ranked new → spreading → recurring, then by lift (× above what release adoption alone explains).
| Signal | When | Version × Cause | Qs | Lift | Served | Example questions |
|---|---|---|---|---|---|---|
| ↗ spreading | 2026-08-10 | v153 × proto:pop | 4 | 3.3× | 75% ans · 1.1h | 1597551 1597571 1597638 1597683 |
| ↗ spreading | 2026-08-04 | v153 × m:microsoftemail | 5 | 3.2× | 100% ans · 0.8h | 1596545 1596547 1596591 1596602 1596606 |
| ↻ recurring | 2026-08-14 | v153 × proto:pop | 4 | 3.5× | 100% ans · 8.0h | 1598311 1598314 1598327 1598357 |
| ↻ recurring | 2026-08-13 | v153 × proto:pop | 4 | 3.3× | 100% ans · 1.2h | 1598091 1598146 1598151 1598175 |
What moved
Cause clusters (provider / protocol / AV)
| Cause clusters (provider / protocol / AV) | July 2026 | August 2026 | Change |
|---|---|---|---|
| m:spectrum | 5 | 31 | ▲ +26 |
| m:yahooemail | 30 | 50 | ▲ +20 (+67%) |
| m:microsoftemail | 36 | 47 | ▲ +11 (+31%) |
| proto:imap | 56 | 66 | ▲ +10 (+18%) |
| proto:smtp | 35 | 40 | ▲ +5 (+14%) |
| m:gmail | 73 | 69 | ▼ -4 (-5%) |
| proto:oauth | 20 | 16 | ▼ -4 (-20%) |
| m:comcast | 13 | 12 | ▼ -1 (-8%) |
🆕 New cause clusters (first appearance ever)
None — every cause cluster in August 2026 has appeared in a prior month.
Release adoption (version mix)
| Release adoption (version mix) | July 2026 | August 2026 | Change |
|---|---|---|---|
| v153 | 101 | 423 | ▲ +322 (+319%) |
| v140 | 186 | 63 | ▼ -123 (-66%) |
| v152 | 211 | 6 | ▼ -205 (-97%) |
| v154 | 2 | 173 | ▲ +171 |
| v150 | 26 | 23 | ▼ -3 (-12%) |
| v115 | 16 | 24 | ▲ +8 (+50%) |
Operating-system mix
| Operating-system mix | July 2026 | August 2026 | Change |
|---|---|---|---|
| os:windows | 589 | 702 | ▲ +113 (+19%) |
| os:linux | 61 | 86 | ▲ +25 (+41%) |
| os:macos | 45 | 56 | ▲ +11 (+24%) |
| os:android | 7 | 10 | ▲ +3 |
| os:other | 11 | 6 | ▼ -5 (-45%) |
Topic mix
| Topic mix | July 2026 | August 2026 | Change |
|---|---|---|---|
| send-and-receive-email | 185 | 217 | ▲ +32 (+17%) |
| email-and-messaging | 82 | 75 | ▼ -7 (-9%) |
| customization | 73 | 82 | ▲ +9 (+12%) |
| passwords-and-sign-in | 53 | 55 | ▲ +2 (+4%) |
| connectivity | 25 | 44 | ▲ +19 (+76%) |
| import-and-export-email | 30 | 33 | ▲ +3 (+10%) |
Prototype engineering month-over-month summary · from Project 1 feature tables + spike detectors · August 2026 vs July 2026.
Last updated: 2026-08-30 20:06 UTC