Microsoft Exchange 2016 CU23 SU19 · Version Status
Microsoft Exchange 2016 CU23 SU19 End of Life Date
Microsoft Exchange 2016 CU23 SU19 end-of-life date, support status, and CVE risk. Data reconciled from official vendor documentation and endoflife.date at every build; the source of each date is on the product page.
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Microsoft Exchange 2016 CU23 SU19 is past end of life. This version no longer receives security patches. 389 days past EOL — migrate to a supported version immediately.
EOL Date
Oct 14, 2025
389 days past EOL
Latest Release
15.1.2507.61
Standard release
Release Date
Oct 1, 2015
Microsoft Exchange 2016 CU23 SU19 series
Extended Support
Oct 2026
Extended support · ended
Where these dates come from
End of lifeOct 14, 2025Vendor's own page, read by our adapter · learn.microsoft.com · checked Nov 3, 2026high · 3 sources agree End of active supportOct 13, 2020Vendor's own page, read by our adapter · learn.microsoft.com · checked Nov 3, 2026high · 3 sources agree End of extended supportOct 2026Vendor's own page (our correction) · techcommunity.microsoft.com · checked Oct 18, 2026medium · 1 source agrees ReleaseOct 1, 2015Vendor's own page, read by our adapter · learn.microsoft.com · checked Nov 3, 2026high · 3 sources agree Confidence: high = two or more independent sources agree (the vendor's page read by our adapter, a person's check against the vendor, the dataset the date came from); medium = one; low = the vendor page disagrees or our last read is stale.
How we source dates.
Lifecycle detail
Microsoft Exchange 2016 was released on October 1, 2015 and support ended on October 14, 2025 — a supported lifespan of 10 years and 1 month, in line with the 10 years and 1 month median for Microsoft Exchange releases. Its latest release on record is 15.1.2507.61, published October 14, 2025 — on the day support ended. It has been past its end-of-life date for 1 year and 1 month.
Attack Surface
10/30 Medium tier
CISA KEV Exposure
20/20 Named in CISA KEV
Extended Support
0/10 Available
EOL Risk Score™ — proprietary methodology by endoflife.ai. Factors: EOL recency, attack surface breadth, CISA KEV catalog presence, extended support availability. Updated at every build.
Methodology → ·
View score card →
Extended Support
Extended Microsoft Exchange 2016 CU23 SU19 support options
Some vendors and third parties sell security patches beyond end of life; whether one covers this version varies. Compare your options.
Compare Options →
All Microsoft Exchange Versions
What does Microsoft Exchange 2016 CU23 SU19 end of life mean?
When Microsoft Exchange 2016 CU23 SU19 reaches end of life, the maintainers stop issuing security patches for this version. CVEs discovered after the EOL date are publicly disclosed on the National Vulnerability Database with no patch available. Exploit code frequently appears on GitHub within days of disclosure.
The CVE blind spot: A CVE-based scan does not show the ongoing accumulation of unpatched vulnerabilities in EOL software versions. Some scanners flag unsupported versions of common products, but coverage varies, and none of them give you the date in advance. Running Microsoft Exchange 2016 CU23 SU19 past its EOL date creates a growing attack surface that a clean scan result does not rule out.
Migrate to Microsoft Exchange Subscription Edition SU11 or implement compensating controls — network segmentation, enhanced monitoring, restricted access — while migration is underway.
Frequently Asked Questions
When does Microsoft Exchange 2016 CU23 SU19 reach end of life?
Microsoft Exchange 2016 CU23 SU19 reached end of life on October 14, 2025. This version is no longer receiving security patches.
Is Microsoft Exchange 2016 CU23 SU19 still supported?
No. Microsoft Exchange 2016 CU23 SU19 reached end of life on October 14, 2025 and is no longer receiving security patches.
What should I upgrade to from Microsoft Exchange 2016 CU23 SU19?
The recommended upgrade from Microsoft Exchange 2016 CU23 SU19 is
Microsoft Exchange Subscription Edition SU11 — the latest actively supported version. Check the
Microsoft Exchange full timeline for all supported versions.
What are the security risks of running Microsoft Exchange 2016 CU23 SU19 past EOL?
Since Microsoft Exchange 2016 CU23 SU19 reached end of life, the maintainers no longer issue security patches. Any CVEs disclosed after the EOL date accumulate with no vendor fix. A CVE-based scan does not show this — it is the CVE blind spot; some scanners flag unsupported versions of common products, but coverage varies and none give the date in advance. Organizations running EOL Microsoft Exchange should migrate immediately or implement compensating controls.