End of life
Synology DSM (DiskStation Manager) · DSM 4.2 (LTS)
All published support, including security fixes, has ended. The published end-of-support date was 2017-06 — 3320 days ago.
Scope: software releaseAs of 2026-08-01
Lifecycle timeline
- 2015-06 — End of active support · End of maintenance
- 2017-06 — End of support · End of standard support
Why this status?
GA Mar 2013; oldest version in Synology's published lifecycle table.
DSM (DiskStation Manager) releases still inside the support window
- DSM 7.4 — support ends 2028-06
- DSM 7.3 (LTS) — support ends 2028-10
Reported as still supported by the cited source. Synology documents the upgrade path for your edition and contract — confirm there before planning change work.
Evidence
- Synology Software Life Cycle Policy (PDF, last updated Jul 3, 2026) Official · checked 2026-07-15
- End-of-Life Announcement for DSM 6.2 Official · checked 2026-07-15
- End-of-Availability notice for legacy DSM, Surveillance Station, SRM, and more Official · checked 2026-07-15
- End-of-Life Announcement for Mail Station and Synology Mail Server Official · checked 2026-07-15
- Synology Product Support Status (model lookup portal) Official · checked 2026-07-15
- Synology DSM 6.2 EOL announcement Official · checked 2026-07-15
Keep going
Status derived deterministically from the published milestones. When a vendor does not publish a date, this page says so — it never guesses.