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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →For a desktop app that combines email with calendar and contact tools, start by comparing eM Client and Thunderbird. Windows users focused on bringing multiple inboxes together can also consider Mailbird, but check its calendar and contact capabilities separately. None is a guaranteed one-for-one replacement: your operating system, mail provider, work-account policies, and reliance on Outlook features determine which will fit.
Which New Outlook alternative fits your needs?
Pick a shortlist based on the job you need the app to do, then verify it with the accounts and workflows you actually use. Product feature lists are useful starting points, not proof that every calendar, contact field, or work feature will sync in your configuration.
| Candidate | Best starting point | What to verify |
|---|---|---|
| eM Client | You want email together with calendar and contact functions. | Its vendor comparison lists mail, calendar, task, and contact support separately. Confirm the exact account type and calendar/contact sync behavior you need. |
| Thunderbird | You want to evaluate an alternative email client and its available features. | Check current provider-specific calendar and contact support. Comparisons that cover the standard download may not include community extensions. |
| Mailbird | You use Windows and prioritize managing multiple email accounts in a unified inbox. | Do not infer full calendar or contact replacement from its email strengths; confirm those functions and their account support separately. |
| Classic Outlook | You depend on a classic Outlook capability and want to compare Microsoft’s two Outlook versions. | Check Microsoft’s current feature-by-feature comparison for the exact workflow, especially local archives and specialist features. |
The eM Client and Mailbird comparisons cited here are vendor-published. Thunderbird is featured on its official product page and in eM Client’s comparison. Treat vendor listings as claims to test against your setup, rather than independent compatibility tests.
What to compare before switching
- Devices and operating systems: Confirm support for every computer or device you use; a Windows-focused option may not suit a mixed-device setup.
- Email account type: IMAP, POP3, Exchange/EWS, Microsoft 365, Gmail, and iCloud are not interchangeable. A client may connect to an account without supporting every provider-specific feature.
- Calendars and contacts: Check both directions of sync, supported protocols, shared or delegated calendars, and whether required contact fields are preserved. eM Client’s comparison separates mail, calendar, task, and contact protocols, including IMAP, POP3, Exchange/EWS, CalDAV, CardDAV, Google Calendar, and Google Contacts.
- Work collaboration: If your work depends on shared mailboxes, delegates, group calendars, a Global Address List, or meeting scheduling, test those exact tasks. Behavior can depend on your Microsoft 365 or Exchange setup and organization policies.
- Archives and migration: Identify whether messages, calendar items, and contacts live in online accounts, local files, or both. Check the target app’s import and export options before moving.
- Cost, licensing, and data access: Check each vendor’s current regional price, free-plan limits, account or device limits, storage model, and offline behavior. These details are not established here and can change.
How New Outlook differs from classic Outlook
New Outlook and classic Outlook do not have identical feature support. Microsoft’s feature comparison lists availability by feature rather than treating either version as a complete match for the other. In the comparison table available on October 4, 2026, PST support was marked available in classic Outlook and partial in new Outlook. The table also showed many calendar features in both versions alongside individual differences and features still developing.
#1 Best Overall
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That distinction matters if you rely on local Outlook data files or a specific specialist workflow. Check Microsoft’s current “Feature comparison between new Outlook and classic Outlook” for the exact feature row before changing versions; the table is updated over time, and its status can change.
How to test a replacement before moving everything
- Make an inventory. Note where your email, calendar events, and contacts are stored: on a mail server, in a provider account, in local files such as PSTs, or in more than one place.
- List must-keep workflows. Write down any requirements such as shared calendars, recurring meetings, attachments, time zones, categories, delegates, or particular contact fields.
- Check the target’s exact account support. Compare the provider, protocol, and work-account requirements with the client’s current documentation. If an organization manages the account, confirm policy and access requirements with its administrator.
- Try a representative profile or small transfer. Connect a test account or move a limited sample before migrating your main setup. Include the kinds of messages, events, and contacts that matter to you.
- Inspect the result before committing. Check that important items appear in the right place and that recurrence, attachments, time zones, categories, shared access, and contact fields behave as needed.
Microsoft says New Outlook supports importing mail, calendar events, contacts, and tasks, while its feature comparison marks PST support as partial. Import availability does not by itself establish that every local archive or item will transfer as expected. Test the source and destination versions you plan to use, particularly for legacy PST data.
Quick Recap
Best Value
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Rank #2
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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