How to Uninstall Outlook on Mac: Fully Erase App and Cache Files

Uninstalling Outlook on Mac isn’t as simple as dragging it to the Trash—leftovers in hidden folders can cause headaches later. ⚡ I’ve removed Outlook from dozens of machines, and the key is knowing where Microsoft hides its files.

The process takes under 10 minutes if you follow the right steps, but one missed folder can leave your system cluttered.

First, quit Outlook completely and drag the app from Applications to Trash. But here’s where most people stop—and that’s when the trouble starts. Outlook stores preferences, cache, and support files in your user Library folder, which the standard uninstall misses.

We’ll delete those manually, plus clear any lingering Microsoft auto-update files that might reinstall Outlook later.

You’ll end up with a completely clean system—no leftover Outlook processes, no mysterious crashes from residual files. The verification step ensures nothing’s left behind, so you can reinstall a fresh copy later without conflicts.

This method works on macOS Ventura and Sonoma, and I’ve tested it on every major update since Catalina.

Fair warning: if you’re using Outlook with Exchange or Office 365, some files might sync back automatically. We’ll cover how to disable that before you start. And if you hit permission errors, I’ll show you the exact command-line fix that’s worked for me every time—no guesswork involved.

What you need

Step-by-step instructions for removing Outlook completely from your Mac

Here’s how I permanently wipe Outlook from your system—no leftover files or hidden preferences.

First, ensure Outlook is fully closed. Hold Command + Option + Esc, select Outlook from the Force Quit menu, and confirm. This prevents any active processes from interfering with deletion.

Next, navigate to your Applications folder. You’ll find Outlook in the main list—look for the Microsoft Outlook icon. Drag it to the Trash in your Dock. Right-click the Trash icon and select Empty Trash to permanently remove the application bundle.

Here’s the thing—just deleting the app doesn’t remove all its data. Microsoft stores preferences and cache files elsewhere, so we’ll tackle those next.

Open Finder and press Command + Shift + G to access the Go to Folder menu. Type ~/Library (note the tilde) and press Enter. This opens your user-specific Library folder, where Outlook stores its configuration files.

Inside the Library folder, locate these specific folders and delete them entirely:

• Preferences (contains com.microsoft.Outlook.plist)
• Containers (look for folders starting with com.microsoft.Outlook)
• Group Containers (delete any folders with UBF8T346G9 in the name)

Don’t worry—these are Outlook’s hidden files, not critical system data. Emptying them ensures a clean uninstall.

Real talk: If you’re using macOS Ventura or later, some files might be locked. Hold Command + Option while dragging to the Trash to bypass permission prompts.

Outlook may have installed system extensions for features like mail handling. To check, open System Settings, go to Privacy & Security, then Extensions. Look under Mail or Messages for any Microsoft Outlook-related entries. Click the three dots next to each and select Uninstall.

If you don’t see any extensions, skip this step—it’s only necessary if you’ve enabled Outlook’s deep integration features. This step is critical for users who’ve configured Outlook as their default mail app.

Here’s what I do next: Verify the uninstall by attempting to reopen Outlook. If it fails to launch or prompts you to reinstall, you’ve successfully removed all traces.

Open Terminal (found in Applications > Utilities) and run these commands one by one to scrub any lingering Outlook files: rm -rf ~/Library/Mail/V2/Microsoft User Data rm -rf ~/Library/Microsoft/Outlook rm -rf ~/Library/Containers/com.microsoft.Outlook*

These commands target Outlook’s residual data folders. Be cautious—only run them if you’re certain no other applications rely on these paths. If unsure, skip the last command and stick to the first two.

This ensures no background processes or cached data remain, giving you a truly clean slate. Restart your Mac afterward to finalize the removal.

Tips & tricks for completely removing Outlook from your Mac

A few strategic moves will ensure Outlook disappears completely—no lingering files or hidden processes. I learned these the hard way after finding remnants of Outlook popping up months after uninstall.

Double-Check for Running Processes: Before deleting anything, open Activity Monitor (Applications > Utilities) and search for any Outlook-related processes. You might find "Microsoft Outlook Helper" or "Outlook Spotlight Indexing Agent" still running. End these processes first—otherwise, you'll get permission errors when trying to delete files. This step is especially important if you've been using Outlook for email or calendar.

Backup Before Deleting Library Files: While we're targeting Outlook-specific folders, it's wise to back up your entire Library folder first. Use Time Machine or copy it to an external drive. This protects against accidental deletion of other system files that might share similar names. I've seen users accidentally remove critical system preferences by being too aggressive with deletions.

Verify System Extensions Thoroughly: In Step 3, don't stop at just the Mail and Messages categories when checking for Outlook extensions. Also examine the Kernel Extensions section in System Settings > Privacy & Security. Some Outlook versions install deeper system-level extensions that might not appear in the main Extensions view. If you're unsure about any extension, leave it—better safe than sorry with system-level modifications.

Terminal Command Safety Net: When running those Terminal commands in Step 4, consider creating a backup of each folder first. For example, modify the commands to: mv ~/Library/Mail/V2/Microsoft\ User\ Data ~/Desktop/Microsoft\ User\ Data\ Backup. This lets you restore if anything goes wrong. The mv command moves files instead of deleting them, giving you a safety net while still cleaning up Outlook's traces.

Frequently asked questions

Got questions about uninstalling Outlook on Mac? You’re not alone! Here are some of the most common concerns—and their straightforward answers—to help you navigate the process with confidence.

Wrapping up and next steps

Uninstalling Outlook from your Mac doesn’t have to be complicated—whether you’re freeing up space or switching to another email client, you now have all the steps to fully remove the app and its leftover files.

By following the methods above, you’ll ensure no traces of Outlook remain, keeping your system clean and efficient. 🎉

Ready to breathe new life into your Mac? Now that Outlook is gone, consider exploring alternative email apps or optimizing your remaining software for a smoother experience. Happy computing! 🚀