Outlook AI Assistant Guide - Add-ins, Permissions, and Setup
Microsoft Copilot brings AI features to Outlook for Microsoft 365 subscribers, and third-party tools can also integrate via OAuth. This guide covers what Copilot does, how third-party tools connect, what permissions to review, and how to check your privacy settings in the Microsoft account portal.
Outlook users have three different paths to AI help: features built into Microsoft 365, third-party Outlook add-ins, and separate drafting tools that work from prompts without connecting to the mailbox. The best choice depends less on brand name and more on your environment: personal Outlook, small-business Microsoft 365, or a managed corporate tenant with administrator controls. Gmail users should see the Gmail AI assistant guide instead.
The three Outlook AI assistant paths
Before comparing products, separate the workflow you need. A built-in Microsoft feature is convenient when your organization already pays for it. A third-party add-in can offer narrower email-specific features. A no-connection drafting tool is safest when your work account blocks third-party consent or when you only need help writing a reply.
| Path | Best for | Main access question |
|---|---|---|
| Microsoft 365 built-in AI | Teams already standardized on Microsoft 365 who want Outlook, Teams, Word, and SharePoint context in one environment | Is the feature enabled for your license and tenant? |
| Outlook add-in or OAuth tool | Users who want email-specific drafting, triage, or follow-up features beyond standard Outlook | Which Microsoft Graph permissions does the app request? |
| Prompt-based writer | People who cannot connect work email or who only need help writing occasional replies | Can you remove sensitive details before prompting? |
| Native Outlook rules plus AI drafting | Teams that already have rules for filing messages but still need faster written responses | Which tasks should remain deterministic rules rather than AI? |
The important distinction is where the email content goes. Built-in Microsoft features operate inside the Microsoft 365 environment. Third-party add-ins and OAuth tools connect through Microsoft Graph and then process data under their own privacy policy. Prompt-based writers only see what you paste or describe.
Built-in Outlook AI features to check first
Many Outlook accounts already include small AI or automation features even without a major add-on. These are worth testing before installing anything new because they do not add another vendor to your data flow.
| Feature area | What to look for | When it is enough |
|---|---|---|
| Suggested replies | Short one-click responses under simple messages | Routine acknowledgements and low-stakes replies |
| Focused Inbox | Automatic separation of important and lower-priority messages | Basic triage without third-party inbox sorting |
| Rules and Sweep | Deterministic filing, cleanup, and recurring sender handling | Newsletters, receipts, reports, and known sender patterns |
| Premium Microsoft 365 AI | Thread summaries, assisted drafting, and cross-app context where enabled | Organizations that already approve and fund the full Microsoft stack |
If those features solve the immediate problem, stop there. Adding a third-party assistant only makes sense when you need better personalization, more flexible drafting, richer inbox triage, or a workflow your Microsoft plan does not include.
Third-party Outlook add-ins and OAuth tools
Third-party Outlook AI tools connect in two main ways: as add-ins installed inside Outlook, or as external apps authorised through Microsoft OAuth. Both can be useful, but neither should be treated as automatically safe just because the consent screen appears inside a Microsoft flow.
- Native add-ins show up as a button or side panel inside Outlook. They still have their own vendor, privacy policy, and data handling terms.
- OAuth-connected apps usually live outside Outlook and use Microsoft Graph to read mailbox data, create drafts, send mail, or manage folders depending on approved scopes.
- Browser extensions can interact with Outlook on the web. Check exactly what websites and page content the extension can read.
- Prompt-only tools do not integrate with Outlook. They are less automated but easier to use when IT policy blocks app consent.
A useful rule: the more automated the assistant is, the more specific your permission review needs to be. A tool that drafts text from your prompt is very different from a tool that can read every mailbox folder and send mail as you.
How Outlook AI data handling differs by setup
There is no single "Outlook AI privacy policy" that covers every option. Data handling depends on whether the feature is Microsoft-native, an add-in, an OAuth app, or a prompt-based tool.
- Microsoft-native features are governed by your Microsoft account, tenant configuration, and Microsoft 365 data terms.
- Third-party add-ins may send selected email content to their own servers for processing and storage.
- OAuth tools can access whatever Microsoft Graph scopes you approve, including read, write, or send permissions.
- No-connection writers only receive the text you provide, so you can redact names, account numbers, and confidential details first.
For regulated teams, the right question is not "does it work with Outlook?" but "which contract and data processor covers the content?" Ask that before connecting any tool to a mailbox containing client, legal, financial, or health information.
Outlook/M365 permissions
When a third-party tool requests access to your Outlook account, it does so through Microsoft's OAuth flow. In a corporate Microsoft 365 environment, an IT administrator may need to grant "admin consent" before any individual in the organization can authorise the connection. Some organizations configure their tenants to block all third-party app consent by default, meaning your individual approval is insufficient - You need IT approval even after you click through the consent screen.
The permissions a tool requests determine what it can do. "Read your mail" means the tool can access message content but cannot take action. "Read and write access to your mail" means the tool can read messages and also send email from your account, move messages, and delete messages. "Send mail as you" means the tool can send email that appears to come from your address - This is the highest-risk permission type. For a full breakdown of what Outlook permission descriptions mean, see our guide on AI email safety and permissions.
| Permission scope | What it allows | Risk level |
|---|---|---|
| Mail.Read | Read all email in the mailbox. Cannot send, move, or delete. | Medium |
| Mail.ReadWrite | Read, create, update, and delete email. Can move messages between folders. | High |
| Mail.Send | Send email from the user's address. Can send without the user seeing the email first. | High |
| Mail.ReadBasic | Read metadata and limited content. Cannot read full message bodies. | Low-medium |
| User.Read | Sign in and read the user's profile. No email access. | Very low |
Vendor permission review for Outlook AI tools
The key things to check for every Outlook assistant are the same: the requested Microsoft Graph scopes, whether the vendor stores message content, whether generated drafts are saved anywhere, and whether an administrator needs to approve the connection before it becomes active.
M365 admin policies for third-party apps
In corporate Microsoft 365 environments, administrators can configure policies that control whether users can consent to third-party app connections at all. These policies are managed in the Microsoft Entra admin center (formerly Azure Active Directory).
The key policy is the "User consent settings" in Entra. Administrators can configure this to:
- Allow user consent for all apps: Users can connect any third-party app by approving permissions themselves.
- Allow user consent for verified apps only: Users can only connect apps that have been verified by Microsoft. Reduces but does not eliminate risk.
- Require admin approval for all apps: Users see a "Request approval" screen rather than a consent screen. The connection only goes live after an administrator approves it.
- Block all app consent: Users cannot connect any third-party app. This is the strictest setting and is common in highly regulated industries.
If you work in a corporate M365 environment and cannot connect a third-party tool, this policy is likely the reason. Contacting your IT helpdesk is the right first step. If the policy is "require admin approval," your IT team can review and approve specific tools rather than requiring a blanket policy change.
Setting up an AI tool with Outlook
Before connecting any third-party AI tool to Outlook, work through this checklist:
Privacy settings - Exact paths
Here are the exact navigation paths to review and change privacy and access settings in Outlook and the broader Microsoft account:
Review all third-party app access (personal and work accounts): Go to account.microsoft.com/privacy. Select "Apps and services that can access your data." You will see every app that has been granted access to your Microsoft account. Click any app to view its permissions and remove access if needed.
Manage Outlook add-ins (Outlook desktop): In Outlook, go to Home → Get Add-ins (or the Apps icon depending on your Outlook version). Click "My Add-ins" in the left sidebar of the store panel to see all installed add-ins. To remove one, click the three-dot menu next to it and select "Remove."
Manage Outlook add-ins (Outlook for the web): Go to Settings (gear icon) → View all Outlook settings → Mail → Customize actions or look for "Manage add-ins" in the settings search bar. The path varies slightly by tenant configuration.
Copilot settings (Microsoft 365 enterprise): Copilot availability and data policies are set at the tenant level by your administrator. Individual users cannot enable or fully disable Copilot - That control sits with IT. If Copilot is available in your account, you may find Copilot preferences within Outlook Settings → Copilot (if the tab is shown). For data governance questions about Copilot, your Microsoft 365 administrator or account team are the right contacts.
Copilot settings (personal Microsoft account): Go to account.microsoft.com/privacy. Under "Microsoft Copilot," you can review conversation history settings and, where available, manage how Copilot data is stored for your account.
Which Outlook AI workflow should you use?
Use this decision table to choose the safest workflow before you start comparing brands:
| Factor | Built-in Microsoft features | Third-party Outlook assistant | No-connection drafting tool |
|---|---|---|---|
| Best fit | Your organization already enables the feature and wants Microsoft-managed controls | You need deeper email-specific automation than Outlook provides by default | You need reply help but cannot grant mailbox access |
| Access pattern | Operates inside your Microsoft 365 environment | Requires Microsoft permissions to read, write, or send depending on feature set | Only sees the text you paste or describe |
| Setup friction | Low if already enabled; high if IT needs to purchase or configure it | Medium to high because admin consent may be required | Low because no OAuth connection is needed |
| Privacy tradeoff | Fewer vendors, but broad Microsoft 365 context may be in scope | More automation, but another vendor processes mailbox data | Less automation, but much narrower data exposure |
| Best first test | Ask IT which Microsoft AI features are already enabled | Submit the app for admin review with scopes and privacy policy attached | Draft three real replies from redacted prompts and measure editing time |
| When to avoid | When you only need occasional replies and the add-on is not already approved | When the app asks for send or write access without a clear reason | When you need automatic inbox triage or full thread context |
Choose built-in Microsoft features if your organization already enables them and you want fewer vendors in the data flow.
Choose a third-party Outlook assistant if you need features Microsoft does not provide in your plan and your IT team approves the requested scopes.
Choose a no-connection drafting tool if the bottleneck is writing clear replies and you do not need the tool to read your mailbox directly.
Works without connecting Outlook. Describe the email you received and your key points - Get a personalized draft in seconds. No subscription or inbox access needed.
For users weighing up the broader market, the best AI email assistants guide covers dedicated email tools in one place. If your specific decision is Word.now against Microsoft's paid assistant, use the Word.now vs Microsoft Copilot comparison after you have confirmed your Microsoft 365 license and tenant settings.