| Service | Microsoft Docs article | Related commit history on GitHub | Change details |
|---|---|---|---|
| platform | High Quality Message Extension | https://github.com/MicrosoftDocs/msteams-docs/commits/main/msteams-platform/messaging-extensions/high-quality-message-extension.md | For a plugin to be validated, invoked, and work seamlessly, ensure that it meets | Response Time | Response time must not exceed 9 seconds for 99 percent, 5 Seconds for 75 percent and 2 Seconds for 50 percent. [*Mandatory*] | | Reliability | Apps must maintain 99.9% availability. For instance, if Microsoft 365 Chat calls a plugin 1,000 times, it must provide a meaningful response 999 times. [*Mandatory*] | | Zero Regressions | If you need to resubmit your app for validation, the existing message extension functionality that was working earlier mustn't break. This requirement is only applicable to independent software vendor (ISV) apps and not apps built for your organization. [*Mandatory*] |-| [Microsoft 365 Channel](#requirements-for-plugins-in-word-powerpoint-excel-and-onenote-copilots)| For users to interact with your message extension from Outlook, you need to add Microsoft 365 channel to your bot. For more information, see [Add Microsoft 365 channel](../m365-apps/extend-m365-teams-message-extension.md#add-microsoft-365-channel-for-your-app). [*Mandatory*]| -| [Single sign-on (SSO)](#requirements-for-plugins-in-word-powerpoint-excel-and-onenote-copilots) | If applicable, update your Microsoft Entra ID app registration for SSO. [*Recommended*] | -| [Content Security Policy](#requirements-for-plugins-in-word-powerpoint-excel-and-onenote-copilots) |If applicable, modify your Content Security Policy headers. [*Recommended*] | +| [Microsoft 365 Channel](#requirements-for-plugins-in-copilot-for-microsoft-365)| For users to interact with your message extension from Outlook, you need to add Microsoft 365 channel to your bot. For more information, see [Add Microsoft 365 channel](../m365-apps/extend-m365-teams-message-extension.md#add-microsoft-365-channel-for-your-app). [*Mandatory*]| +| [Single sign-on (SSO)](#requirements-for-plugins-in-copilot-for-microsoft-365) | If applicable, update your Microsoft Entra ID app registration for SSO. [*Recommended*] | +| [Content Security Policy](#requirements-for-plugins-in-copilot-for-microsoft-365) |If applicable, modify your Content Security Policy headers. [*Recommended*] | > [!IMPORTANT] > If applicable, update your Content Security Policy headers and `X-Frame-Options` in accordance with [Configure Content Security Policy headers](../m365-apps/extend-m365-teams-personal-tab.md#configure-content-security-policy-headers). Copilot extensions customize and extend the Copilot for Microsoft 365 experience If you've developed a plugin for Copilot in Teams or [copilot.microsoft.com](https://copilot.microsoft.com/#/), you're already aware of the benefits it offers to users within their workflow. <!--To extend your plugin's functionality to Copilot in Word, Excel, PowerPoint, and OneNote, refer to the following document for the required additional steps.--> -### Requirements for plugins in Word, PowerPoint, Excel, and OneNote Copilots +### Requirements for Plugins in Copilot for Microsoft 365 -To ensure your plugins work with Word, Excel, PowerPoint, and OneNote Copilots, follow these requirements: +To ensure your plugins work with Word, Excel, PowerPoint, OneNote, Office, and Outlook Copilots, follow these requirements: * <b>Update Microsoft Azure Active Directory (Azure AD) app registration for SSO-enabled apps</b> To ensure your plugins work with Word, Excel, PowerPoint, and OneNote Copilots, | Microsoft 365 App | frame-ancestor permission | | | |+ | All hosts (New) | `*.cloud.microsoft` | | Word | fa000000125.resources.office.net | | PowerPoint | fa000000129.resources.office.net | | Excel | fa000000124.resources.office.net | |