Outlook Error Code 150 on Mac: How to Fix It

Ritu Roy | fix how to mac os outlook error outlook for mac software technology | 5 minutes read | Last updated on May 19th, 2025,

If you’re a Mac user and you’ve encountered Outlook Error Code 150, you’re likely experiencing difficulties with your Outlook account setup or connection. This error can be frustrating, but don’t worry, it’s a common issue that can be resolved with a few simple steps. In this article, we’ll walk you through the possible causes of Outlook Error Code 150 on Mac and provide solutions to get you back up and running.

What is Outlook Error Code 150?

Outlook Error Code 150 typically occurs when there’s an issue with your account configuration, connectivity, or Outlook installation. This error prevents Outlook from functioning properly, making it difficult to send or receive emails, or even launch the application. The root causes of this error are varied but usually relate to issues like incorrect account settings, a corrupted Outlook profile, or connection problems.

Common Reasons for Mac Outlook Error Code 150

A poor or unstable internet connection can interrupt the communication between Outlook and the mail server.
Running an outdated version of Outlook can lead to compatibility issues and errors such as Code 150.
Sometimes, your Outlook profile may become corrupted, leading to persistent errors.
Misconfigured email settings can trigger this error, particularly if server details are incorrect.
Outlook stores cached data, and if this data becomes corrupt, it can cause performance issues or errors like Code 150.

How to Fix Outlook Error Code 150 on Mac? – DIY Solutions

Check Your Internet Connection

A weak or unstable internet connection is one of the first things you should check. Without a solid connection, Outlook might fail to sync with your mail server, triggering Error Code 150. To rule out this possibility, make sure your Mac is connected to a reliable Wi-Fi network or Ethernet connection. Try opening a website or using another app to verify that the internet is working properly.

Update Outlook to the Latest Version

Outlook errors are often the result of using outdated software that may not be compatible with your operating system or other applications. To ensure that you have the latest bug fixes and improvements, update Outlook:

Open Outlook.
Go to Help > Check for Updates.
If updates are available, install them and restart Outlook.

Updating to the latest version of Outlook can often fix many problems, including Error Code 150.

Rebuild Your Outlook Profile

A corrupted Outlook profile is another frequent cause of this error. Rebuilding your profile can resolve many issues related to data corruption:

Close Outlook.
Open Keychain Access (found in Applications > Utilities).
Delete any stored credentials related to Outlook.
Open Outlook again and create a new profile by navigating to Tools > Public Folders > New Profile.
Re-enter your email account details and check to see if the error is resolved.

Check Your Account Settings

Another common cause of Outlook Error Code 150 is incorrect account settings. If you’re unsure about the configuration of your email account, double-check your settings:

Open Outlook and go to Tools > Accounts.
Select the problematic account and verify that the incoming and outgoing mail server settings (IMAP/SMTP) are correct.
If needed, consult your email provider’s documentation to ensure you have the right configuration details for your account.

Clear Outlook’s Cache

Sometimes, the cache files Outlook uses to store temporary data can become corrupted, leading to errors. Removing these cache files can help resolve the issue:

Close Outlook.
Open Finder and navigate to ~/Library/Group Containers/UBF8T346G9.Office/Outlook.
Delete the Outlook Profile folder.
Restart Outlook and see if the issue is fixed.

Reinstall Outlook

If none of the above solutions work, reinstalling Outlook can often help resolve persistent errors. Here’s how to reinstall Outlook on your Mac:

Go to your Applications folder and drag Outlook to the Trash.
Visit the Mac App Store or Microsoft’s website to download the latest version of Outlook for Mac.
Install Outlook and set up your email account again.

Reinstalling Outlook ensures that any corrupted files or settings are completely removed, which can help resolve many errors, including Code 150.

The most frequent cause of Outlook for Mac error code 150 is a problem with the file that the user is attempting to submit. The file might not be able to be sent because it is corrupt. In order to send the file to the recipient, it must first be repaired.

Additionally, this issue may also be caused by faulty file conversion. Many people utilize the manual way to convert Outlook files for Mac, which frequently leads to data loss or damage.

Software Fix for Corruption Caused by Mac Outlook Error Code 150

Next, we have MacArmy OLM Converter for Mac. The program completes the batch conversion all at once and provides precise results in a matter of seconds. It is also designed to be user-friendly so that any user can profit from it and easily access the content of OLM files. Download it now to safeguard yourself against future encounters with related issues.

Steps to Fix Corruption Outlook Error Code 150

Follow the steps listed below to resolve Outlook Error Code 150. Before you begin, make sure you have a strong internet connection, and then take the necessary steps to address it.

Enter your Outlook login information.
From Outlook Settings, select Preferences.
Select Comcast to remove the existing Outlook account.
Now select “OK.”
Click the plus (+) symbol to add the Outlook account once it is finished.
In Outlook’s settings, check through the available accounts and select the one you wish to add.
After adding the account, remove all of the emails, temporary files, rubbish, and folders.
Following a restart, Outlook for Mac will launch without any issues.
You have finished.

Wrapping Up!

Outlook Error Code 150 on Mac can be caused by a variety of issues, from network problems to corrupted profiles. However, with the troubleshooting steps outlined above, you should be able to resolve the issue and get Outlook back to functioning smoothly.

After fixing Outlook Error Code 150 on Mac, always remember to back up your account data to avoid the risk of data loss. If issues persist, importing your old OLM files into a new Outlook profile could be the solution. The MacArmy OLM to PST Converter for Mac makes this process easy, allowing you to convert and restore your data to ensure that your email experience remains uninterrupted. With these steps, you can safeguard your Outlook data and enjoy a smooth, error-free experience.