In shortBrief summary first
Microsoft 365 Copilot Cowork is the task-oriented part of Microsoft 365 Copilot. You describe an outcome, after which Cowork gathers information, creates a plan and carries out work across Microsoft 365 applications. It can, for example, prepare a meeting, create a presentation, coordinate calendars and prepare a follow-up message.
Cowork became generally available worldwide on 16 June 2026. Its main difference from regular Copilot Chat is action. Chat produces an answer or draft. Cowork can break down a longer assignment, use tools and perform actions while you inspect and approve sensitive steps.
Cowork requires a Microsoft 365 Copilot user subscription licence and usage-based billing enabled by an administrator. Consumption is measured in Copilot Credits. Treat output as a draft, review recipients and sources, and start with a bounded pilot group.
01What Copilot Cowork actually is
Cowork is a task environment inside the Microsoft 365 Copilot app. Microsoft describes it as an agentic system, not as a single agent. It can combine multiple models, sources and skills. The user remains in charge and can follow, steer, pause or cancel the work.
Cowork uses your existing Microsoft 365 permissions. It only sees data that you are allowed to access. Work context can include emails, calendar events, Teams conversations, people and files in OneDrive or SharePoint.
| Good fit | Poorer fit |
|---|---|
| Multi-step work with a clear outcome | A quick factual question that Chat can answer directly |
| Work spanning several Microsoft 365 applications | Decisions with major legal, medical or employment consequences |
| Repeatable work patterns with checkpoints | Vague requests without sources, boundaries or an owner |
| Preparing, organising, analysing and drafting | Unsupervised changes to critical information |
02Cowork, Copilot Chat and agents compared
| Aspect | Copilot Chat | Cowork | Copilot agent |
|---|---|---|---|
| Main purpose | Questions, writing and summaries | Execute an outcome across multiple steps | Specialist knowledge or process support |
| Duration | Usually seconds to minutes | Minutes to hours | Depends on the conversation and setup |
| Actions | Limited and mainly interactive | Works across apps and requests approval where needed | Depends on connected actions and sources |
| Best choice | One quick task or thinking question | A bounded multi-step assignment | A persistent specialist assistant for a team or subject |
03Access, licences and costs
You can access Cowork through m365.cloud.microsoft and the Microsoft 365 Copilot desktop app for Windows and Mac. Microsoft also lists mobile, Outlook and Teams support, with features varying by platform.
User licence
The user needs a Microsoft 365 Copilot User Subscription License. A regular Microsoft 365 licence with web-based Copilot Chat alone is not sufficient.
Enable billing
An administrator links a billing method and activates usage-based AI experiences in the Microsoft 365 admin centre.
Policies and limits
Administrators can set access, monthly limits, alerts and hard spending caps for users or groups.
Model conditions
The official start guide lists Anthropic models enabled in the tenant as a prerequisite. Administrators manage available model families.
How Copilot Credits are consumed
Task costs depend on four inputs: model use, context retrieval, tool calls and runtime. Image generation and browser work can also consume credits. There is therefore no reliable fixed price per assignment.
Check direct consumption with /cost
Users do not have to wait for the admin centre or an invoice to inspect consumption for an active task. Open a Cowork session in which work has already been performed, type /cost in the prompt field and press Enter. Cowork then reports inline how many Copilot Credits that task has consumed.
Measure the baseline
Run /cost before starting a new representative step and record the reported credits.
Run one step
Have Cowork create one report, conduct one piece of research or compare one defined group of files.
Measure again
Run /cost afterwards. The difference provides a practical indication of the incremental credit use of that step.
Record the task type
Capture purpose, scale, sources, model, runtime and credits to build useful cost assumptions.
/cost reports consumption for the relevant task, not total tenant consumption and not automatically a final price in your currency. Final cost also depends on your payment model, contract, prepaid capacity and discount tier. Use the Cost Management dashboard for organisation-wide control. Microsoft also noted during introduction that /cost did not work immediately in every tenant.
Pay as you go or buy credits up front?
Microsoft offers two types of prepaid credit alongside pay-as-you-go. They are different products suited to different consumption patterns.
| Payment model | How it works | When it becomes useful | Main risk |
|---|---|---|---|
| Pay as you go | The linked Azure subscription pays for actual consumption. | For a pilot, variable use, or when reliable consumption data is not yet available. | Costs can grow without alerts, limits and a hard cap. |
| Copilot Studio capacity pack | A tenant pack containing 25,000 Copilot Credits per month. Multiple packs can be purchased and assigned through policies. | When monthly consumption is stable, for example across Cowork, Copilot Chat agents and SharePoint agents together. | A pack is poor value when actual use remains well below 25,000 credits. |
| Copilot Credit Pre-Purchase Plan (P3) | An annual discounted commitment. Microsoft applies higher discounts at larger commitment tiers, covering eligible use for one year. | When measured organisation-wide annual demand is predictable and the saving outweighs underuse risk. | It is a one-year commitment, renews automatically by default and cannot be cancelled or exchanged according to Microsoft. |
Start with pay as you go. Buy a capacity pack only when measured monthly use repeatedly approaches a multiple of 25,000 credits. Consider P3 only when you have a stable annual forecast and enough scale to benefit from the discount tiers. Include other eligible Copilot services in the calculation.
If you combine capacity packs, P3 and pay-as-you-go, Microsoft uses them in this order: capacity packs first, P3 second and pay-as-you-go last. Review consumption in both the Microsoft 365 and Power Platform admin centres because multiple services may use the same capacity.
Start with ten to twenty recognisable tasks and measure consumption for at least two full usage periods by task type, team and service. Base any pack or annual commitment on proven baseline use, not an optimistic growth scenario.
04Your first task, step by step
Choose one outcome
Do: start with a meeting brief or weekly report.
Why: a clear end state helps Cowork plan.
Mistake: combining unrelated goals.
Tip: define what done means.
Add context
Do: reference people, mail, meetings, Teams and cloud files.
Why: relevant sources reduce guesswork.
Mistake: assuming Cowork knows your intention.
Tip: specify period and source location.
Set boundaries
Do: state what Cowork may change, send or share.
Why: boundaries prevent unintended actions.
Mistake: giving full freedom during a first test.
Tip: keep external communication in draft.
Follow and review
Do: inspect steps, sources, files and approval cards.
Why: you remain accountable for the result.
Mistake: reviewing only the final file.
Tip: pause after a critical intermediate step.
05Main capabilities
- Communication
- Draft, reply, forward and send email. Post in Teams channels and chats. Prepare stakeholder communications.
- Documents
- Create or edit Word documents, Excel workbooks, PowerPoint presentations and PDFs.
- Calendar and meetings
- Schedule meetings, help resolve conflicts, add Teams links and prepare daily and meeting intelligence.
- Search and research
- Search organisational information and conduct deep research across multiple sources.
- File management
- Create folders and organise files in OneDrive and SharePoint. Cowork cannot delete files or folders there.
- Recurring work
- Run scheduled or event-driven prompts within governance boundaries.
06Writing effective prompts
A good Cowork assignment includes an outcome, context, sources, method, boundaries and checkpoints.
Six building blocks
- Outcome: what must be ready at the end?
- Context: which project, team and audience?
- Sources: which files, conversations, people and period?
- Steps: which order or intermediate output?
- Boundaries: what must not be changed, sent or shared?
- Control: where should Cowork stop for approval?
07Working with context and files
You can add Microsoft 365 work context, select cloud files or upload local files. Cowork saves created files in your OneDrive and SharePoint workspace. Always inspect permissions and sensitivity labels for confidential work.
| Context | Good practice | Watch out for |
|---|---|---|
| Email and Teams | Limit the period, thread and sender | Old or informal messages can distort conclusions |
| Calendar and people | Specify time zone, duration and required attendees | Review external attendees before approval |
| OneDrive and SharePoint | Point to a specific folder or version | Cowork inherits existing access, including excessive access |
| Local upload | Use only necessary files below 200 MB | Encrypted or rights-protected files cannot be read |
08Approvals, pauses and steering
For sensitive actions such as sending email, posting in Teams or scheduling a meeting, Cowork presents an approval request. Review content, recipients, attachments, date and technical parameters before allowing the action.
- Approve once: Cowork performs only this action.
- Do not ask again: permission applies to similar actions in the current session only.
- Soft pause: the current step finishes before Cowork pauses.
- Hard pause: the running step is interrupted immediately.
- Cancel: ends the task when the outcome or approach must change.
During the pilot, have Cowork prepare all external communication as drafts. Approve sending only after human review.
09Tasks, schedules and automation
My tasks shows work that needs input, is in progress, is complete or is scheduled. Scheduled prompts can run repeatedly. Microsoft also documents event-driven tasks, such as work triggered by a matching email or Teams message.
Automated tasks run with the creator's permissions. Shared-system actions require approval by default unless they were pre-authorised. Microsoft applies rate limits, loop protection, audit logging and Purview policies.
- Run the assignment manually several times first.
- Document sources, exceptions and expected output.
- Check average Copilot Credit consumption.
- Schedule it at a safe frequency with a clear owner.
- Review quality, cost and permissions periodically.
10Skills and plugins
Skills teach Cowork how to perform a type of work. Built-in skills include Word, Excel, PowerPoint, PDF, email, scheduling, calendar management, meetings, daily briefing, enterprise search, deep research, communications and Adaptive Cards.
Create custom skills
You can create a skill through Customize, by asking Cowork in chat or by placing a SKILL.md file in OneDrive under /Documents/Cowork/skills/. Microsoft documents a maximum of fifty custom skills.
Microsoft does not validate user-created skills. A skill contains instructions that steer Cowork. Upload only trusted files, read the instructions and test every change in a new conversation.
| Choice | Use it when | Example |
|---|---|---|
| Skill | You want to repeat a method, quality requirement or template | A weekly project report in one format |
| Plugin | Cowork needs specialist knowledge or an external data source | Retrieve market data or use another business system |
| Copilot agent | A team needs a persistent specialist assistant with knowledge sources | HR policy or internal service desk |
| Copilot Studio | You are building a governed solution with processes and integrations | An organisation-wide approval process |
11Practical use cases by role
Project lead
Prepare a meeting from recent messages and files, structure risks, create a presentation and draft a stakeholder update.
Management
Combine calendar, meeting papers and status reports into a daily brief. Have Cowork flag exceptions and missing decisions.
HR
Prepare communications and schedules for an internal programme. Do not use unsupervised Cowork tasks for selection, appraisal or decisions that materially affect a person.
Finance
Compare workbooks, explain variances and build a management presentation. Have a qualified person verify figures, formulas and source versions.
Marketing and communications
Gather campaign information, create a report and prepare channel-specific drafts. Review facts, brand voice and recipients.
12Responsible adoption
Prepare
Review permissions, data quality, sensitivity labels, model families, plugins and roles. Define out-of-scope tasks.
Run a bounded pilot
Choose a small group, three departments and ten repeatable tasks. Keep communication in draft by default.
Measure
Track time saved, corrections, failed tasks, Copilot Credits, source quality and user confidence.
Scale
Share proven prompts and skills, set group limits and schedule reviews by process owners and IT.
Pilot checklist
- An owner for every process and an escalation point for errors.
- A current permissions review for SharePoint, OneDrive and Teams.
- A spending policy with alerts and a hard cap.
- Approved example prompts with fixed checkpoints.
- Rules for external communication, personal and confidential data.
- A record of time saved, corrections and unwanted outcomes.
13Limitations and pitfalls
- No accuracy guarantee: documents and messages can contain inaccurate or ungrounded claims.
- Complexity: long tasks with many dependencies can slow down, be misinterpreted or end incomplete.
- Permission dependency: Cowork does not fix excessive existing access.
- File limits: no local files without upload, no deletion in OneDrive or SharePoint, no encrypted files and a 200 MB attachment limit.
- Language: Microsoft states that Cowork is optimised for English. Carefully test other languages and specialist terms.
- Skills and plugins: quality and safety also depend on their author and publisher.
- Variable costs: a broad task can activate many sources, models and tools.
14Security, privacy and governance
Actions run through the user's Microsoft 365 account. Microsoft states that prompts, responses and data accessed through Microsoft Graph are not used to train foundation models. Files are processed in a temporary isolated environment within the Microsoft 365 service boundary and that environment is removed after the task.
- Manage access, discoverability, billing, limits, models and plugins in the Microsoft 365 admin centre.
- Use Microsoft Purview for audit, eDiscovery, data lifecycle, Insider Risk Management, Communication Compliance and data security.
- Review which models act as subprocessors. Microsoft documents Anthropic models as well as Microsoft-hosted models.
- Edge browser use follows existing sign-ins, conditional access, browsing policies and audit logging when enabled.
- Review permissions before rollout because Cowork inherits existing rights, including unintended excessive access.
Do not use Cowork autonomously for hiring, appraisal, credit, healthcare, insurance or legal-status decisions. Microsoft explicitly warns against uses with consequential effects on people's rights or opportunities.
15Frequently asked questions
Is Cowork included in my Microsoft 365 subscription?
Not in every subscription. You need a Microsoft 365 Copilot user licence and an administrator must enable usage-based billing.
Can Cowork send something without my approval?
Sensitive actions require approval by default. Similar actions may be allowed for the remainder of a session, and scheduled tasks can sometimes be pre-authorised. Add organisational controls for higher-risk work.
Where are Cowork files saved?
Created files are saved in your OneDrive and SharePoint workspace and can be previewed or downloaded from the side panel.
How many custom skills can I create?
Microsoft documents up to fifty. A SKILL.md file may be up to 1 MB and a skill can include up to twenty companion files totalling 10 MB.
How can I see the cost of my current Cowork task?
Type /cost in the open Cowork session. Cowork reports that task's consumption in Copilot Credits. To approximate the incremental use of one step, record the value before and after it. Use the admin centre for consolidated reporting and the final cost picture.
Does Cowork replace Power Automate or Copilot Studio?
No. Cowork is useful for flexible, human-delegated knowledge work. Power Automate and Copilot Studio remain important for deterministic automation, advanced integrations and centrally governed solutions.
16Glossary
- Agentic system
- An AI environment that turns an outcome into steps and combines models and tools.
- Copilot Credits
- The unit for usage-based AI experiences. Consumption depends on model, context, tools and runtime.
- Skill
- A set of instructions that teaches Cowork how to perform a specific kind of work.
- Plugin
- An extension containing skills, external connectors or both.
- Work IQ
- The context layer that helps use work data, relationships and activity within Microsoft 365.
- Approval card
- A control window in which the user reviews, permits or cancels a sensitive action.
FinallyOur recommendation
Cowork is most valuable when work spans applications, recurs and has a clear verifiable outcome. Start with drafts, explicit sources and fixed approval points. Measure time, quality and Copilot Credits by task type before increasing autonomy.
Combine technical setup with user skills. The Microsoft 365 Copilot training from Mellaart Trainingen covers effective prompting, responsible use, everyday Microsoft 365 applications, agents and a practical introduction to Cowork.
SourcesVerified on 6 August 2026
- learn.microsoft.com/en-us/microsoft-365/copilot/cowork/, official overview
- support.microsoft.com/en-us/microsoft-365-copilot/get-started-with-cowork, getting started
- learn.microsoft.com/en-us/microsoft-365/copilot/cowork/use-cowork, usage, skills and scheduled prompts
- learn.microsoft.com/en-us/microsoft-365/copilot/cowork/cowork-faq, common questions and limitations
- learn.microsoft.com/en-us/microsoft-365/copilot/cowork/cowork-admin-governance, governance, models, browser use and security
- learn.microsoft.com/en-us/microsoft-365/copilot/usage-based-billing-manage-copilot-credits, Copilot Credits and cost management
- learn.microsoft.com/en-ca/microsoft-365/copilot/pay-as-you-go/copilot-capacity-packs, capacity packs with 25,000 monthly credits
- learn.microsoft.com/en-us/azure/cost-management-billing/reservations/copilot-credit-p3, annual Pre-Purchase Plan and discount tiers
- techcommunity.microsoft.com/blog/healthcareandlifesciencesblog/copilot-cowork-is-ga---heres-how-to-track-your-credit-usage-as-an-end-user/4528879, Microsoft explanation of the
/costcommand - learn.microsoft.com/en-us/microsoft-365/copilot/responsible-ai/copilot-cowork-application-card, responsible use and known limitations
- microsoft.com/en-us/microsoft-365/blog/2026/06/16/copilot-cowork-is-now-generally-available/, general availability and pricing model