Exchange Online
EWS retirement: what changed on 1 October and what to do now
Exchange Online started enforcing the retirement of Exchange Web Services (EWS) on 1 October 2026. Apps that still use EWS can stop working unless you allow-list them, and even then only until 1 April 2027.
2-page PDF · Checked October 2026
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SharePoint
SharePoint version history: where your storage is really going
Version history is one of the biggest hidden storage costs in SharePoint. The default keeps 500 major versions of every file with no expiry, and every version counts against your quota.
2-page PDF · Checked October 2026
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AI regulation
The EU AI Act after the Digital Omnibus: what applies to Copilot rollouts now
Regulation (EU) 2026/1744, the Digital Omnibus on AI, came into force on 27 July 2026. It delayed the high-risk rules and softened the AI literacy duty, but the Act still applies.
2-page PDF · Checked October 2026
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Copilot in SharePoint
Copilot in SharePoint is GA: get ready for 1 November
General availability of Copilot in SharePoint began rolling out on 30 September 2026. The PowerShell controls used during the preview to opt tenants and sites in or out stop being honoured on 1 November 2026.
2-page PDF · Checked October 2026
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Windows
13 October 2026: the Windows deadlines and what to do this week
Several Windows lifecycle dates land on the same Patch Tuesday, 13 October 2026. The big one for business is the end of Windows 10 Extended Security Updates (ESU) Year 1.
2-page PDF · Checked October 2026
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Oversharing
The oversharing toolkit for the Copilot-in-SharePoint era
Restricted Content Discovery (RCD) now also removes AI entry points from restricted sites, and from 1 November 2026 it's the main site-level brake for Copilot in SharePoint. It's a brake, not a fix.
2-page PDF · Checked October 2026
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Copilot licensing
Copilot Credits: control the cost before advanced AI goes live
Microsoft says usage-based billing "will begin to roll out in Copilot in Q4 CY2026". Everyday Copilot stays in the per-user licence.
2-page PDF · Checked October 2026
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Copilot agents
Agent sprawl: find the agents nobody owns
Agents become ownerless when the person who created them is deleted. The Agent Registry in the Microsoft 365 admin centre lists every agent available to your tenant and flags the ones without owners.
2-page PDF · Checked October 2026
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SharePoint
2026 SharePoint retirements: prove you're actually clean
Three legacy SharePoint Online areas ended in 2026: Add-ins, Azure ACS and SharePoint 2013 workflows (2 April), InfoPath Forms Services (14 July) and SharePoint Alerts (July). Here's how to find what still depends on them, what to replace it with, and how to lock the door.
2-page PDF · Checked October 2026
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Exchange Online
SMTP AUTH Basic authentication: sort the scanners before December
At the end of December 2026, Exchange Online disables SMTP AUTH Basic authentication by default for existing tenants. Admins can switch it back on, but Microsoft will announce the final removal date in the second half of 2027.
2-page PDF · Checked October 2026
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SharePoint
SharePoint one-time passcode retirement: keep your partners' access
From mid-October 2026 Microsoft retires SharePoint's own one-time passcode (SPO OTP). External people who were shared files the old way and have no matching Microsoft Entra B2B guest account will get "access denied" until a guest account exists.
2-page PDF · Checked October 2026
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Microsoft Teams
Teams external chats: the late-October defaults
Four changes land in Teams chats with people outside your organisation from October 2026. Most are sensible, but two need a decision, and one has a hard date: Teams user reporting switches on by default on 25 October unless you opt out.
2-page PDF · Checked October 2026
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Copilot
Agents become plugins: control advanced uploads
From 25 October 2026, users can upload advanced Copilot agents by default unless you restrict it. At the same time, Agents become Plugins in Copilot and users can create their own skills.
2-page PDF · Checked October 2026
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Microsoft Entra
Passkeys by default: the SMS, voice and password reset dates
Microsoft Entra now defaults to passkeys. Microsoft-provided SMS and voice codes retire in 2027, and self-service password reset (SSPR) stops trusting contact details users never registered from early November 2026.
2-page PDF · Checked October 2026
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Microsoft 365
Targeted Release is retiring: move to Standard, Deferred or Frontier
Microsoft retires Targeted Release for Microsoft 365 services in January 2027, and the act-by date is 31 October 2026. From November you can no longer change who's on it.
2-page PDF · Checked October 2026
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Copilot
Copilot data compliance: retention, OneDrive and memory
Between October and December 2026, Copilot data moves and the retention rules that cover it change. Older Teams retention policies stop covering Copilot, new Copilot Pages land in OneDrive, Purview retention for Copilot memory rolls out and the classic DSPM experiences retire.
2-page PDF · Checked October 2026
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SharePoint
Classic SharePoint pages go read-only: your modernisation plan
Microsoft will block new classic publishing sites from 1 March 2027 and make all remaining classic pages read-only from 1 October 2028. Nothing is deleted, but intranets that still run on classic pages need a plan.
2-page PDF · Checked October 2026
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Microsoft Entra
MemberOf dynamic groups freeze on 3 November: find and fix them in an hour
On 3 November 2026 Microsoft retires the preview memberOf operator in Microsoft Entra ID. Dynamic groups, dynamic administrative units and access-package auto-assignment policies that use it stop updating and stay in their last known state.
2-page PDF · Checked October 2026
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Microsoft Entra
Agent creation in Entra changes on 4 November: the settings to check this week
From 4 November 2026, users without an Entra admin role can create agent blueprints unless you switch it off, and agents stop getting the right to create their own identities automatically. From 30 October, Copilot connectors follow your allowed agent types.
2-page PDF · Checked October 2026
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Power Platform
Power Platform capacity in November: AI Builder credits end, Dataverse limits enforced
From 1 November 2026, AI Builder add-ons retire and new or renewed premium licences stop including AI Builder credits. From 9 November, Microsoft starts enforcing Dataverse storage entitlements for Dataverse-only Dynamics 365 tenants.
2-page PDF · Checked October 2026
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Microsoft 365
The Microsoft 365 change calendar: 30 October to 31 December 2026
25 features, apps and defaults retire or change before the end of the year. Each row has Microsoft's date and its Message center (MC) number, so you can check it in your own tenant.
2-page PDF · Checked October 2026
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SharePoint and OneDrive
The one-link sharing dialog: hero link controls for admins
Microsoft is rolling out a new sharing dialog in SharePoint and OneDrive from early October to the end of November 2026 (MC1454378). Every file and folder gets one main hero link whose audience can be changed after it's been sent.
2-page PDF · Checked October 2026
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Microsoft 365 Apps
Publisher is being removed: find and convert .pub files first
Publisher left Microsoft 365 on 1 October 2026, and Office updates are now removing it: Current Channel from mid-November, Monthly Enterprise Channel from early December. If it still opens on a PC, use that time to convert the files you need.
2-page PDF · Checked October 2026
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Copilot
Copilot buying changes on 1 December: base licences, add-on names and pay-as-you-go
From 1 December 2026 you can buy Microsoft 365 Copilot and Copilot Business without a Microsoft 365 base licence, today's offers stop selling in CSP, and new Copilot Business bought through CSP comes with pay-as-you-go on. Existing subscriptions don't change.
2-page PDF · Checked October 2026
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SharePoint
SharePoint agents move to Agent Builder: upgrade your .agent files before March 2027
From mid-November 2026, new SharePoint and OneDrive agents are built in Microsoft Copilot Agent Builder, not saved as .agent files. Existing .agent files keep working until the end of March 2027, then stop.
2-page PDF · Checked October 2026
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Microsoft Ignite
Ignite 2026 for Microsoft 365 admins: a watch list and a GA-or-preview filter
Microsoft Ignite runs 17-20 November 2026 in San Francisco and online. For admins, the value comes after the keynotes: separating what is generally available from what is preview, and waiting for the Message center post and Learn page that carry real dates.
2-page PDF · Checked October 2026
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Copilot readiness
Copilot oversharing: the 10-point SharePoint check
Copilot only returns what people can already open. Ten checks that find the access nobody meant to give, with where to look and what to fix.
2-page PDF · Checked October 2026
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Copilot licences
Copilot licence review: 6 questions before you renew
Use the reports you already have to tell busy Copilot seats from quiet ones before your renewal.
2-page PDF · Checked October 2026
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