How to Clear Outlook Cache on Mac: Step-by-Step Guide
Neeru Kuchhal
May 15th, 2026
User-Query:
“My Outlook for Mac is running slow because emails are not syncing properly, and search results are incomplete. Someone suggested clearing the Outlook cache. What can I do for clearing Outlook cache on Mac safely?”
— Asked by “Michael Evans”
Introduction: Microsoft Outlook stores temporary mailbox data locally on your Mac to improve performance and enable faster email access. This stored data is known as the Outlook cache. Over time, the cache can become outdated or corrupted. This causes issues such as slow performance, missing emails, synchronization problems, and inaccurate search results. Therefore, clearing the Outlook cache on Mac helps refresh mailbox data. It resolves many common Outlook issues without affecting the original emails stored on the mail server. In this article, you’ll learn the safest methods to clear cache Outlook Mac.
What Happens When You Clear Outlook Cache?
Clearing the cache removes temporary data stored locally in the mailbox and forces Outlook to download data from the server.
It Can Help Fix:
- Outlook is running slowly.
- Mailbox synchronization issues.
- Missing or duplicate emails.
- Incorrect search results.
- Calendar syncing problems.
- Also, Outlook freezes or crashes.
| Important Note: Clearing the cache does not permanently delete emails from the mail server. However, it ensures your mailbox is fully synced before proceeding. |
Clearing Outlook Cache on Mac Manually: Step-by-Step Instructions
There are several methods through which we can complete this task.
Method 1: Clear Outlook Cache for Individual Folders
This is the easiest and safest way to refresh a specific mailbox folder.
- Firstly, open Microsoft Outlook on your Mac.
- Navigate to the folder causing issues.
- After that, right-click the folder.
- Select Properties.
- Click Empty Cache.
- Lastly, confirm the action.
Outlook will automatically re-download updated mailbox data from the server.
Method 2: Remove Outlook Cache Files Manually
If Outlook performance issues continue, manually deleting cache files can help.
- First of all, close Outlook completely.
- Open Finder.
- Click Go and then Go to Folder.
- Enter the following path: ~/Library/Group Containers/UBF8T346G9.Office/Outlook
- Locate cache-related folders and temporary files.
- Further, move unnecessary cache files to Trash.
- In the end, restart Outlook.
The application will rebuild fresh cache files automatically.
Method 3: Rebuild Outlook Database on Mac
Rebuilding the Outlook database refreshes mailbox indexing and resolves deeper corruption issues.
- Close Outlook.
- Hold the Option key and reopen Outlook.
- Open the Microsoft Database Utility.
- Select your Outlook profile.
- Next, click Rebuild.
- Wait for the process to finish.
This method may take time depending on the mailbox size.
Method 4: Clear AutoComplete Cache in Outlook
Sometimes Outlook stores outdated recipient information in the AutoComplete list.
- Open Outlook.
- Now, start composing a new email.
- Type the recipient’s name.
- Hover over the suggested address.
- Click the X icon to remove it.
This refreshes saved email suggestions.
Common Signs You Need to Clear the Cache in Outlook for Mac
Here are some symptoms that indicate Outlook cache problems:
- Outlook takes too long to open.
- Sometimes the emails fail to update.
- Search results are incomplete.
- Mail folders display incorrect counts.
- Attachments do not load properly.
- Moreover, calendar events sync incorrectly.
Real-Life Scenario
A marketing professional using Microsoft Outlook on Mac noticed that emails stopped syncing and Outlook search stopped showing recent messages. After they clear Outlook cache Mac terminal, and rebuilt the database, the mailbox refreshed completely, and Outlook performance improved significantly.
Final Thoughts
In this blog, we have seen that clearing Outlook cache on Mac is one of the most effective ways. Whether you empty the cache for specific folders, manually remove temporary files, or rebuild the Outlook database, these methods help refresh mailbox data safely. For users handling large or complex Outlook mailboxes, OLM Converter can provide better stability and long-term performance improvements on macOS.
Frequently Asked Questions
Ans. No, clearing the cache in Microsoft Outlook does not permanently delete your emails from the mail server. It only removes temporary locally stored data, and Outlook re-downloads fresh mailbox information during synchronization.
Ans. Outlook cache files are usually stored inside the macOS Library folder under the Outlook profile data directory. These files contain temporary mailbox data, attachments, and synchronization information used by Outlook for faster access.
Ans. No, clearing the Outlook cache generally does not permanently remove contacts, calendars, or emails stored on the server. Once Outlook reconnects and syncs again, all mailbox items are restored automatically from the email account.
Ans. Yes, Microsoft Outlook allows users to clear Outlook cache Mac for individual folders. You can right-click the folder, open its properties, and select the “Empty Cache” option to refresh only that specific mailbox folder.
About The Author:
I am Neeru Kuchhal, a Technical Content Writer who focuses on turning complex ideas into clear, engaging, and impactful content. I combine creativity with strategy to write blogs, web content, and technical articles that connect with the right audience and support brand goals. I believe great content is not just written. It is thoughtfully created to inform, build trust, and drive action.
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