[Outlook] (accounts) Clarify add-in support for non-Microsoft mailbox accounts

[samantharamon]

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[Copilot]

Pull Request Overview

This PR clarifies Outlook add-in support for non-Microsoft mailbox accounts by updating documentation and linking related sections.

• Updated metadata dates across multiple docs
• Clarified that add-ins aren’t available for non-Microsoft accounts (e.g. Gmail) with supporting links
• Added a new "Supported accounts" section with a detailed table in the overview document

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
docs/outlook/outlook-mobile-addins.md	Updated metadata and clarified non-Microsoft account support
docs/outlook/outlook-add-ins-overview.md	Updated metadata; added a new "Supported accounts" section and table
docs/outlook/one-outlook.md	Updated metadata and added a note linking to the supported accounts section

Comments suppressed due to low confidence (1)

docs/outlook/outlook-add-ins-overview.md:106

• [nitpick] Consider replacing the HTML list syntax in the table cell with Markdown formatting if this aligns with the project's style guidelines, to improve consistency and readability.

|Mac|<ul><li>If a non-Microsoft account was added using the IMAP CloudCache option, add-ins are supported.</li><li>If a non-Microsoft account was added using the IMAP Direct option, add-ins aren't supported.</li></ul>|