Skype for Business Server End of Life (EOL) Dates & Support Timeline
Complete end-of-life dates, support windows, and security status for all Skype for Business Server versions. Data sourced from endoflife.date and official vendor documentation. Updated at every deploy.
Skype for Business Server Subscription Edition is supported, with no end-of-life or end-of-support date announced yet. 2 of 3 tracked Skype for Business Server versions are past end of life; the most recent to reach it, 2019, did so on October 14, 2025. The full Skype for Business Server 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 | Days | Status |
|---|---|---|---|---|---|
| 2015 | — | Jul 30, 2015 | Oct 14, 2025 | 361 days past EOL | EOL |
| 2019 | — | Oct 22, 2018 | Oct 14, 2025 | 361 days past EOL | EOL |
| Subscription Edition | — | Jul 1, 2025 | TBD | Supported | Active |
Live EOL badge for your README — updates automatically at every build.
[](https://endoflife.ai/microsoft-skype-for-business-server)
Skype for Business Server lifecycle status — the real story
Skype for Business Server is Microsoft's on-premises server for instant messaging, presence, conferencing and Enterprise Voice. Its Edge Server role is what lets remote, federated, mobile and anonymous users outside the internal network use the deployment.
Skype for Business Server 2015 and 2019 followed the Fixed Lifecycle Policy and both reached the end of support on the same day. Microsoft's on-premises replacement is Skype for Business Server Subscription Edition, which follows the Modern Lifecycle Policy, requires subscription licenses or licenses with active Software Assurance, and is installed as an in-place upgrade of a Skype for Business Server 2019 server.
CISA lists a Skype for Business vulnerability (CVE-2023-41763, privilege escalation) as known exploited, and NVD lists Skype for Business Server 2015 and 2019 as affected. A 2015 or 2019 server, above all an Edge Server reachable from outside, no longer receives fixes for flaws like it.
Skype for Business Server release and support pattern
Across the 3 release lines with a published release date, Skype for Business Server has shipped a new line roughly every 5 years (median interval). A line typically stays supported for about 8.6 years from its release to its end-of-life date (measured on the 2 lines with both dates published).
Of the 3 release lines tracked, 2 are past end of life and 1 is still within support. The newest line, subscription, was released July 1, 2025. No end-of-life date is currently published for the 1 supported line.
Computed from the tracked release data at every build — the figures above are the dates in the table, restated, not an editorial estimate.
Skype for Business Server security intelligence
CISA KEV history: Skype for Business Server is named in CISA's Known Exploited Vulnerabilities catalog 1 time, most recently on 2023-10-10. Derived from CISA's live catalog at every build.
What does Skype for Business Server end of life mean for your organization?
When a version of Skype for Business Server 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 Skype for Business Server 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 Skype for Business Server 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 Skype for Business Server versions. This is a bridge, not a permanent solution — plan your migration in parallel.
Skype for Business Server has 2 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 Skype for Business Server 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."