Microsoft Exchange End of Life (EOL) Dates & Support Timeline
Complete end-of-life dates, support windows, and security status for all Microsoft Exchange versions. Data sourced from endoflife.date and official vendor documentation. Updated at every deploy.
Microsoft Exchange Subscription Edition SU9 is supported, with no end-of-life or end-of-support date announced yet. 10 of 11 tracked Microsoft Exchange versions are past end of life; the most recent to reach it, 2019 CU15 SU5, did so on October 14, 2025. The full Microsoft Exchange lifecycle, with every version's release and end-of-support date, is in the table below.
Running an EOL version? Get matched with support options — free ↓| Version | Latest Release | Release Date | EOL Date | Extended Support | Days | Status |
|---|---|---|---|---|---|---|
| 4.0 SP5 | 4.0.996 | Jun 11, 1996 | Not published | — | Past EOL | EOL |
| 5.0 SP2 | 5.0.1460 | May 23, 1997 | Jan 10, 2006 | — | 7559 days past EOL | EOL |
| 5.5 SP4 | 5.5.2653 | Feb 3, 1998 | Jan 10, 2006 | — | 7559 days past EOL | EOL |
| 2000 SP3 | 6.0.6620.7 | Nov 29, 2000 | Jan 11, 2011 | — | 5732 days past EOL | EOL |
| 2003 SP2 | 6.5.7654.4 | Sep 28, 2003 | Apr 8, 2014 | — | 4549 days past EOL | EOL |
| 2007 SP3 UR23 | 8.3.517.0 | Mar 8, 2007 | Apr 11, 2017 | — | 3450 days past EOL | EOL |
| 2010 SP3 UR32 | 14.3.513.0 | Nov 9, 2009 | Oct 13, 2020 | — | 2169 days past EOL | EOL |
| 2013 CU23 SU21 | 15.0.1497.48 | Jan 9, 2013 | Apr 11, 2023 | — | 1259 days past EOL | EOL |
| 2016 CU23 SU19 | 15.1.2507.61 | Oct 1, 2015 | Oct 14, 2025 | Nov 1, 2026 Extended support |
342 days past EOL | EOL |
| 2019 CU15 SU5 | 15.2.1544.36 | Oct 22, 2018 | Oct 14, 2025 | Nov 1, 2026 Extended support |
342 days past EOL | EOL |
| Subscription Edition SU9 | 15.2.2562.49 | Jul 1, 2025 | TBD | — | Supported | Active |
Live EOL badge for your README — updates automatically at every build.
[](https://endoflife.ai/msexchange)
Microsoft Exchange release and support pattern
Across the 11 release lines with a published release date, Microsoft Exchange has shipped a new line roughly every 2.8 years (median interval). A line typically stays in standard support for about 10.1 years from its release to its standard-support end date (measured on the 9 lines with both dates published).
Of the 11 release lines tracked, 10 are past end of life and 1 is still within support; 1 is marked end of life without a published date. The newest line, subscription, was released July 1, 2025. No end-of-life date is currently published for the 1 supported line. Upstream also publishes an extended-support phase for 2 lines, shown in the table above.
Computed from the tracked release data at every build — the figures above are the dates in the table, restated, not an editorial estimate.
Microsoft Exchange security intelligence
CISA KEV history: Microsoft Exchange is named in CISA's Known Exploited Vulnerabilities catalog 19 times, most recently on 2026-08-18, including use in ransomware campaigns. Derived from CISA's live catalog at every build.
What does Microsoft Exchange end of life mean for your organization?
When a version of Microsoft Exchange reaches end of life, the maintainers stop issuing security patches. Vulnerabilities discovered after this date are publicly disclosed on the National Vulnerability Database, exploit code appears on GitHub, and your systems remain permanently exposed.
The CVE blind spot: A CVE-based scan does not show the accumulation of unpatched vulnerabilities in EOL software. Some scanners flag unsupported versions of common products, but coverage varies, and none of them give you the date in advance. With a zero-day, nobody knows about the vulnerability. With EOL software, the vulnerability is public — listed, rated, and often weaponized — but no vendor patch is coming. This is one of the most dangerous gaps in enterprise security posture.
Organizations running EOL Microsoft Exchange should treat it as a vulnerability class in their risk register, apply compensating controls (network segmentation, enhanced monitoring, access restriction), and prioritize migration to a supported version.
Your options when Microsoft Exchange reaches end of life
There are four realistic paths. Which one is right depends far more on how long the system needs to keep running than on the version you are on today.
| Option | Best when | Watch out for |
|---|---|---|
| Move to a supported version | The system will outlive the current version's support window and you can schedule the work | Budget for compatibility testing, not just the upgrade itself — that is where the real cost sits |
| Replace the component | The project is unmaintained, or a better-supported alternative exists | The replacement has its own lifecycle and its own end-of-life date — you are changing vendors, not escaping the problem |
| Buy extended support | Migration is genuinely underway but cannot finish before the deadline, or the workload is frozen by certification or a third-party application | A bridge, not a destination — every year purchased is a year the migration still has to happen |
| Document accepted risk | The system is isolated, short-lived, or scheduled for retirement | Only defensible with real compensating controls and a written decision — auditors treat undocumented end-of-life software as a finding |
How to choose, in one question: how many more years does this system need to run? Under a year, extended support (where it exists) is usually cheaper than an emergency migration. One to three years, migrate — support purchased repeatedly costs more than doing the project once, and the project only gets harder as the version ages. Indefinitely, migrate now and plan the next migration before it surprises you.
Worth saying plainly, because vendors selling extended support rarely will: extended support is often the more expensive choice over a multi-year horizon. It is the right answer when a deadline is genuinely unreachable, not as a default. Compare the annual fee against the one-time cost of migrating before committing to either.
Formalizing decisions like this across your estate? Our free EOL policy template is a ready-to-adopt policy with risk tiers, remediation SLAs, and audit mapping — no signup, free to use and share.
Extended Support Options
If you cannot migrate immediately, extended support vendors provide continued security patches for EOL Microsoft Exchange versions. This is a bridge, not a permanent solution — plan your migration in parallel.
Microsoft Exchange has 10 versions past end of life — security patches have stopped, but CVE disclosures haven't. Extended support past the official date exists for many products in this position — whether it exists for Microsoft Exchange is exactly what we check. Tell us where to reach you and we'll reply with matched options and pricing guidance — or an honest "no vendor covers this."