M/MX Series M40 — M40 router
Covered past the OEM cutoff by an independent maintainer.
Modules and units still circulate on the secondary market.
Carrying production traffic? Set the replacement window now, not mid-outage.
Low-criticality role — document the risk, harden backups, retire on your terms.
No. Juniper's last date of support for M40/M20 was Dec 2004 (per the Juniper end-of-sale bulletin) — it is past end of service life.
M40/M20 reached end of sale Dec 2001, per the Juniper end-of-sale bulletin.
Dec 2004 — per the Juniper end-of-sale bulletin.
After the last date of support, M40/M20 units can often be kept in production through third-party maintenance providers. Juniper no longer issues software fixes, support, or hardware replacement for it.