If you recently updated Microsoft Outlook on your Windows computer and are now unable to send or receive emails, you are not alone. Microsoft has begun rolling out a new version of Outlook for Windows, known as “New Outlook,” with one big drawback: it no longer fully supports the conventional IMAP and SMTP email protocols used by most third-party email providers.
This surprise transition has left many users upset, disconnected, and confused about how to regain access to their email.
Let’s begin by understanding what Microsoft has changed.
What’s Changing with Outlook for Windows
Microsoft is releasing a revamped version of its desktop email software dubbed “New Outlook for Windows.” While the design appears more current, the underlying functionality has undergone significant and problematic changes for many users.
IMAP and SMTP Support Is Broken or Missing
Unlike the previous version of Outlook, New Outlook does not fully handle IMAP (incoming email) or SMTP (outgoing email), the two critical protocols used by the majority of non-Microsoft email providers. This implies that if your email account uses conventional email settings (as most do), you may be prevented from sending or receiving messages altogether.
What Does This Mean for You?
- You may no longer be able to connect your email account to Outlook
- Email messages may fail to send or receive, even if your settings appear correct
- You could lose access to a functioning inbox without a clear explanation
Microsoft’s Push Toward Its Own Services
This shift appears to be part of Microsoft’s broader strategy to steer users toward their own services, such as:
- Outlook.com
- Microsoft 365
- Exchange Online
By restricting compatibility with open standards such as IMAP and SMTP, Microsoft makes it more difficult for customers to use third-party email providers, a move that many consider anti-competitive and user-hostile.
If you use email from a source other than Microsoft, this change may affect you now or in the near future. Fortunately, there is a fix.
Who Is Affected by This Change?
The impact of Microsoft’s New Outlook varies depending on the version of the software and how your email account is configured. If your email provider (like most) uses regular IMAP and SMTP protocols, the new version may cause issues.
Below is a breakdown of platforms and their current compatibility with IMAP email accounts:
| Platform | IMAP Support | Affected |
| Classic Outlook (Windows) | Full support | No |
| New Outlook (Windows) | Limited or broken | Yes |
| Thunderbird | Full support | No |
| Outlook for Mac | Full support (currently) | No |
| Outlook for iOS/Android | Partial IMAP support | Minimal issues |
| Outlook.com / 365 Webmail | Microsoft accounts only | Not applicable |
How Can You Tell?
If you’re unsure whether you’re using the new version of Outlook on Windows, check the top-right corner of the Outlook window:
- Look for a toggle labeled “New Outlook”
- If it’s turned on, you’re using the new version
- You may be able to switch it off to return to Classic Outlook, depending on your system
If you’re currently experiencing problems, switching back to the classic version is one temporary option. However, we recommend a longer-term solution, which we’ll cover next.
How to Fix the Problem: Use Thunderbird Instead
If you’re affected by Microsoft’s modifications and can’t send or receive email through Outlook, the most straightforward and most reliable solution is to switch to a different email client that fully supports open email standards, such as IMAP and SMTP.
We recommend Mozilla Thunderbird.
Why Thunderbird?
Thunderbird is a trusted, secure, and fully-featured email application that:
- Fully supports IMAP and SMTP
- Is free and open source
- Is regularly updated and maintained
- Works with virtually all third-party email providers
- Requires no Microsoft account or integration
Thunderbird is a popular choice among users who prioritize control, compatibility, and privacy. It works on both Windows and Mac and has a straightforward setup process for most email accounts.
Advantages
- No service lock-in
- Transparent configuration settings
- Compatible with a wide range of operating systems and email services
- Actively developed by a global, nonprofit-supported community
If you’re looking for a dependable email platform that won’t cut you off from your existing account, Thunderbird is the most user-friendly alternative available.
How to Switch to Thunderbird
Switching from Outlook to Thunderbird is a simple process that takes only a few minutes. Thunderbird is designed to auto-detect your email settings via the IMAP protocol, so most users can get started without any advanced configuration.
Step-by-Step Instructions:
- Download Thunderbird
Go to www.thunderbird.net and download the latest version for your operating system. - Install the Application
Run the installer and follow the on-screen prompts to complete the installation. - Launch Thunderbird and Add Your Email
- Open Thunderbird
- You’ll be prompted to add an email account
- Enter your name, email address, and password
- Thunderbird will attempt to automatically detect the server settings
- Confirm and Finish Setup
- Thunderbird will typically default to using IMAP, which is recommended
- Click “Done” or “Finish” to complete the setup
- Your inbox and folders will begin syncing immediately
Need Help?
If you encounter any issues during setup or have questions about the transition, our support team is here to help. Feel free to reach out by phone or email for step-by-step assistance.
Can I Still Use Outlook?
Whether or not you can continue using Outlook depends on which version you’re currently running.
Classic Outlook for Windows
If you’re still using the traditional version of Outlook, you’re probably not affected. Classic Outlook still supports IMAP and SMTP, so your email account should work correctly.
New Outlook for Windows
If you’ve upgraded to the New Outlook, your ability to use third-party email services is most likely limited or disabled. Microsoft allows some users to revert to the original version. To do this:
- Open Outlook
- Look for the “New Outlook” toggle in the top-right corner
If the toggle is present, switch it off to return to the previous version
However, this rollback option is not guaranteed to be available indefinitely. As Microsoft phased out older versions, you may be compelled to use the new version, which does not fully support non-Microsoft email providers.
Long-Term Recommendation
While the original version of Outlook may still work for the time being, the best long-term answer is to switch to an email client like Thunderbird, which will continue to support open standards and provide dependable access to your email.
Final Recommendations
Microsoft’s decision to limit IMAP and SMTP functionality in New Outlook has already had an impact on many customers, and it is likely to have an even greater impact in the future. If you use a third-party email service and rely on Outlook to handle your inbox, you should take preventative measures now.
Here’s What We Recommend:
- Check your Outlook version: See which version you are using, and revert to Classic Outlook if possible.
- Switch to Thunderbird: For full, long-term compatibility with your email service, Thunderbird remains one of the best and most reliable options. It’s free, secure, and fully supports the email protocols that Microsoft is now limiting.
- Reach out for help: If you need assistance installing Thunderbird or setting up your email account, don’t hesitate to contact our support team. We’re here to walk you through the transition.
FAQs
- Q: Is this change permanent?
A: Microsoft has not committed to reintroducing full IMAP/SMTP support in New Outlook. - Q: Is Thunderbird safe and reliable?
A: Yes, it’s a secure, open-source platform supported by a global development community. - Q: Can I use other email clients?
A: Yes, other IMAP-compatible clients may work, but Thunderbird is the one we support and recommend.