[Outlook] Retire article

[samantharamon]

The contents of the Outlook requirements article is mostly covered in Requirements for running Office Add-ins. This PR moves other relevant content to the general article and retires the Outlook article.

Information about account types is also covered in #5245.

[learn-build-service-prod]

Learn Build status updates of commit 452ba6b:

⚠️ Validation status: warnings

File	Status	Preview URL	Details
.openpublishing.redirection.json	⚠️Warning	View	Details
docs/outlook/add-in-requirements.md	💡Suggestion	n/a (file deleted or renamed)	Details
docs/concepts/requirements-for-running-office-add-ins.md	✅Succeeded	View
docs/toc.yml	✅Succeeded	View

.openpublishing.redirection.json

• Line 1327, Column 98: [Warning: redirection-path-syntax-error] Redirection path syntax is incorrect. 'source_path' should start without '/' and 'source_path_from_root' should start with '/'.

docs/outlook/add-in-requirements.md

• [Suggestion: file-not-redirected - See documentation] File docs/outlook/add-in-requirements.md with URL /office/dev/add-ins/outlook/add-in-requirements was deleted without redirection. To avoid broken links, add a redirection.

For more details, please refer to the build report.

Note: Your PR may contain errors or warnings or suggestions unrelated to the files you changed. This happens when external dependencies like GitHub alias, Microsoft alias, cross repo links are updated. Please use these instructions to resolve them.

[learn-build-service-prod]

Learn Build status updates of commit 8d02f16:

✅ Validation status: passed

File	Status	Preview URL	Details
.openpublishing.redirection.json	✅Succeeded	View
docs/concepts/requirements-for-running-office-add-ins.md	✅Succeeded	View
docs/outlook/add-in-requirements.md	✅Succeeded	n/a (file deleted or renamed)
docs/toc.yml	✅Succeeded	View

For more details, please refer to the build report.

[Copilot]

Pull Request Overview

This PR retires the standalone Outlook add-in requirements article by removing its TOC entry and file, merges its content into the general “Requirements for running Office Add-ins” article, updates the concept page date, and adds a redirect.

• Removed the Outlook-specific requirements TOC entry and file
• Integrated Outlook on-premises server requirements into the main requirements article
• Updated ms.date and added a redirect from the retired article

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
docs/toc.yml	Removed the “Add-in requirements” entry under Outlook
docs/outlook/add-in-requirements.md	Deleted the retired Outlook requirements article
docs/concepts/requirements-for-running-office-add-ins.md	Added Outlook server requirements and updated ms.date
.openpublishing.redirection.json	Added redirect from retired article to the general page

Comments suppressed due to low confidence (1)

docs/concepts/requirements-for-running-office-add-ins.md:29

• [nitpick] Consider adding a clear subheading (e.g., "## Outlook add-in requirements") above this section to improve navigation and readability in the consolidated article.

To test and run an Outlook add-in, the user's Outlook email account must reside on Exchange 2016 or later, which is available through Microsoft 365, Exchange Online, or through an on-premises installation. The user or administrator installs manifest files for Outlook add-ins on that server. For Exchange on-premises installations, the following requirements apply.