Skype for Business EWS retirement preparation

Timelines and exceptions · All guidance changes

Exchange · Official Microsoft guidanceObserved changes retained

Retained observation

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Observation details · observed 23 Oct 09:55 UTC

Observed by ChangeIntel: 23 Oct 09:55 UTC
Source update metadata: 16 Jul 12:02 UTC
First observed on this installation: 6 Oct 08:00 UTC
Last successful check: today 05:02 UTC
Next check due: today 11:02 UTC

Observation time is not publication time, and a comparison does not establish an effective date. Full source bodies are not published; this page holds generated summaries, section headings and, as the page's license allows, Microsoft's changed wording. A documentation edit does not confirm feature availability in an environment.

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Timeline

From the capture of 23 Oct 09:55 UTC

Current window October 2026 this window includes today · $true

5 dates
8 undated sections
9 with conditions
4 recorded changes

August 2026 Published timing is qualified; effectiveness is not confirmed.
1 Oct 2026 Published timing is qualified; effectiveness is not confirmed.
October 2026 Published timing is qualified; effectiveness is not confirmed.
Retired / removedafter 1 Apr 2027 Published timing is qualified; effectiveness is not confirmed.

August 2026 8 weeks agomonth windowend ofthe end of
- Key dates and timelineRequirement
- : Deadlinein What administrators must doRequirement
- Action 1: Configure the EWS allow list (before end of August 2026)Milestone
- Configuration stepsScope1 condition
- Recommended next stepsRecommendation
September 2026 3 weeks agomonth windowbefore
- Configuration stepsRecommendation
1 Oct 2026 3 weeks ago
- $nullin How EwsEnabled worksMilestone
- Configuration stepsScope1 condition
October 2026 this window includes todaymonth windowstarting
- $truein How EwsEnabled worksMilestoneException1 condition
Today · 26 Oct 2026
1 Apr 2027 in 5 monthsafterbeforeRetired / removed · unconfirmed
- GuidanceMilestoneScope
  Microsoft is retiring Exchange Web Services (EWS) in Exchange Online, with full retirement on April 1, 2027. EWS is…
- Key dates and timelineMilestone
- Full EWS retirement, no exceptionsin Key dates and timelineMilestone
- : Deadlinein What administrators must doRequirement
- Action 2: Install the upcoming Skype for Business Server update (before April 1, 2027)MilestoneException1 condition
- Recommended next stepsMilestoneRecommendation

Settings and overrides named on this page

Registry values, policies and cmdlets the source mentions, with the dated steps that name them. Read the source for the values to set.

Get-CsOAuthConfiguration

Requirements, exceptions and scope

GuidanceRequirementScope1 condition2 passages
APPLIES TO: 2015 2019 Subscription Edition…
Who is affectedException2 conditions2 passages
Skype for Business and Exchange integration impactException1 condition1 passage
What administrators must doRequirement3 passages
How EwsEnabled worksException1 condition1 passage
Configuration stepsRequirementScope1 condition3 passages
Recommended next stepsRecommendation3 passages
Get-CsOAuthConfiguration
Related articlesScope1 passage

Extracted automatically from Microsoft's wording. Confirm dates, conditions and whether they apply to you in the source before acting; a month or quarter is a window, not a day.

How this timeline changed

Changes between ChangeIntel's readings of the page, between commits of its source file where Microsoft publishes it, in Internet Archive copies of pages that keep no other history, and entries from Microsoft's own change log (dated as Microsoft dates them). Edits between readings that neither records are unknown.

23 Oct 2026
No longer on the page Recommended next stepsseen by ChangeIntel
~~end of August 2026~~
23 Oct 2026
Recommendation added Recommended next stepsseen by ChangeIntel
end of August 2026
23 Oct 2026
No longer on the page Configuration stepsseen by ChangeIntel
~~the end of August 2026, October 1, 2026~~
23 Oct 2026
Scope added Configuration stepsseen by ChangeIntel
the end of August 2026, October 1, 2026

Observed history and review priority

Captured 23 Oct 09:55 UTC; extracted 23 Oct 09:55 UTC. Extractor: microsoft-1/9/d9863eb412f92fa5ec3a8ca32e2dd7cfe8095530f456ecb1866608d1166a435d.

Review priority. Previously extracted guidance is missing from a later capture · Extracted assertions require review · Applicability or exceptions require review · A published date window is near

0 date changes and 0 condition changes across 1 compared revisions. Suggested check interval: 6 hours.

Earlier unavailable versions and edits between checks are unknown. A missing statement requires review; it does not mean the policy was cancelled. Recovered historical statements are not original revision snapshots.

Retained observations · 3

Compact evidence remains available after full document bodies expire. Earlier extractions can have different vocabulary or capture limitations.

23 Oct 09:55 UTC · 35 candidates
13 Oct 09:16 UTC · 35 candidates
6 Oct 08:00 UTC · 33 candidates

No related evidence found in this installation's recent collection. This does not establish that no announcement exists.

Retained observations

23 Oct 09:55 UTC · shown above
13 Oct 09:16 UTC
The page title or its body outside the tracked passages changed. Review the source for its effect.
6 Oct 08:00 UTC
Baseline for retained history; no earlier retained text to compare.

What changed

First observed 18 Oct 2026

No field changes are shown for this selection.

Cite this recorded revision to keep the same title, summary, facts and links when the page changes.

A day selects the latest observation by the end of that UTC day; today's selection can change until midnight. History starts when this installation records it.