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Switch to new Outlook only after confirming that your account and essential workflows work in it. It supports many common account types and adds features such as native Teams meeting scheduling, but it does not replace classic Outlook for some public-folder, automation, add-in, and offline workflows. You can try new Outlook and return to classic, making a task-based pilot the safest way to decide.
What’s different between new and classic Outlook?
Neither version wins on every feature. New Outlook is the newer client, with capabilities such as message pinning, schedule send, and native Teams meeting scheduling. Classic Outlook retains desktop capabilities that matter to some users, including VBA macros, COM add-ins, Outlook Object Model and MAPI support.
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Microsoft’s feature comparison was updated September 23, 2026, and says its matrix does not list every feature. Treat availability labels such as “partial,” “upcoming,” “revised,” or “under investigation” as a snapshot, not a delivery promise. Check the relevant rows in Microsoft’s feature comparison for workflows that matter to you.
| Decision area | New Outlook for Windows | Classic Outlook for Windows |
|---|---|---|
| Accounts | Supports Microsoft accounts, work or school accounts, Gmail, Yahoo, iCloud, and other IMAP accounts; some server scenarios are partial. | Broad desktop account support, depending on account and Outlook version. |
| Public folders | Limited support; Microsoft advises users who heavily create, modify, or delete public folders to continue with classic Outlook. | Better fit for the documented public-folder management workflows. |
| Offline access | Must be enabled; users choose what data to save and for how long. Microsoft rates support as partial. | Offline mode is available. |
| PST files | Partial support. Current documentation covers reading and managing PST mail, folder operations, and moving messages between PST and mailbox. | Broader legacy PST capabilities. |
| Automation and add-ins | Web add-ins are available; VBA macros, COM add-ins, Outlook Object Model, and MAPI are unsupported. | Supports these legacy mechanisms in Microsoft’s comparison. |
| Newer collaboration and mail features | Native Teams meeting scheduling; examples include pinning and schedule send. | Familiar interface and legacy capabilities; some newer features are not listed as available. |
| Switching back | Can return to classic Outlook or open it for a one-time task, if classic is installed. | Can remain available alongside new Outlook. |
Which accounts and folders are supported?
Microsoft says, “The new Outlook supports most accounts.” Its getting-started guidance names Microsoft, work or school, Gmail, Yahoo, iCloud, and other IMAP accounts. That broad account list does not mean every server configuration or folder feature is fully supported: Microsoft’s comparison marks some Exchange scenarios partial, and public-folder support is limited. See Microsoft’s new Outlook setup guidance and confirm your organization’s account and policy details.
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If you routinely create, modify, or delete public folders, Microsoft specifically recommends staying with classic Outlook for those tasks. Simply being able to connect an account is not proof that all the shared folders, server features, or administrative tasks you use will behave the same way.
What features are missing or limited in new Outlook?
Automation and desktop integrations
Microsoft’s matrix lists VBA macros, COM add-ins, Outlook Object Model, and MAPI as unavailable in new Outlook. Web add-ins are available in both clients, but that does not establish that a web add-in can replace a particular COM add-in or reproduce its functionality. If a business process depends on a macro, integration, or custom automation, identify its exact mechanism before switching.
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Custom forms, files, and SharePoint workflows
Microsoft’s comparison also has gaps in areas including custom forms, local or network file access, and SharePoint-to-Outlook integration. Check those exact rows if you rely on them; do not assume a similar-looking feature in the new client covers the same workflow.
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PST archives
Support has expanded to include several everyday PST operations, including managing mail and folders and moving messages between a PST and a mailbox. Microsoft still rates PST support as partial and notes that some classic capabilities remain unavailable. If you depend on exporting archives or specialized PST file management, verify those tasks rather than treating basic archive access as full parity. The status of PST support in Microsoft’s comparison was dated June 2026.
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Offline work
Offline access in new Outlook requires setup: users select the data to save and how long to retain it. Microsoft rates the feature as partial. Some actions remain possible without a connection, but this does not establish the same offline behavior as classic Outlook. Microsoft’s comparison dated its offline support status to August 2026; consult Microsoft’s instructions for working offline and test the tasks you need before relying on it during travel or an outage.
Who should switch—and who should wait?
New Outlook is worth trying if you:
- Use a supported Microsoft, work or school, or mainstream IMAP-connected account.
- Primarily read, send, search, and organize mail and manage calendars.
- Want the newer interface or native Teams meeting scheduling.
- Can verify that your essential folders, add-ins, and offline tasks work before making it your regular client.
Keep classic Outlook or run a careful pilot if you:
- Heavily manage public folders.
- Depend on VBA, COM add-ins, Outlook Object Model, or MAPI.
- Use custom forms, local or network file workflows, or SharePoint integration with Outlook.
- Rely on specialized PST tasks or need offline behavior that has not been confirmed in new Outlook.
- Manage Outlook for an organization where account support, licensing, deployment channel, or policy affects which client is available.
How to test new Outlook without committing
- Confirm your account and policy. Identify the account type and Exchange or server arrangement, and check with your organization’s IT administrator if the account is managed.
- Try setup with the account you actually use. Microsoft’s setup guidance allows settings to be imported or that step to be skipped. Compare the resulting account, folders, and preferences with your needs.
- Exercise your real workflow. Open the specific shared or public folders and PST archives you use; test required add-ins, macros, templates, rules, and automation.
- Test offline tasks deliberately. Enable offline access, choose the data to save, disconnect from the network, and check the mail and calendar tasks you expect to perform.
- Keep classic installed until the test is complete. Use new Outlook for normal work, then use classic for any task that fails or is not supported. Recheck Microsoft’s current comparison for unresolved features.
Can you switch back to classic Outlook?
Yes, Microsoft documents both a route to return to classic Outlook and an option to open classic for a one-time task while using new Outlook. These routes depend on classic Outlook being installed. Follow Microsoft’s instructions for switching back if you need to restore the classic client.
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Automatic-switch prompts are not universal. Microsoft’s guidance describes notifications for small and medium businesses on the Current Channel with a Business plan starting January 2025, and for qualifying personal subscription users starting October 2024. Eligible users can switch back, and Microsoft documents an opt-out setting. Those conditions do not cover every enterprise work or school account or every license combination. Check Microsoft’s automatic-switch guidance and your organization’s deployment policy rather than assuming the prompt or rollout applies to you.
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