How to Uninstall and Reinstall Outlook: Clean Reinstall Without Lingering Data

Uninstalling and reinstalling Outlook can feel like opening a stubborn jar—except this time, you won’t lose your emails. ⚡ I’ve helped dozens of folks through this process, and the key is treating it like a surgery: precise, clean, and with all your data backed up first.

The worst mistake? Skipping the prep work and ending up with half-deleted profiles or corrupted files that haunt your fresh install.

Before you touch anything, export your Outlook data—emails, contacts, and calendars—to a safe spot like OneDrive or a USB drive. Then, close Outlook completely (yes, even the background processes—use Task Manager if you’re unsure).

The uninstall itself is straightforward: you can go through Control Panel’s "Programs and Features" or use the Microsoft Store if you installed it that way. Pro tip: if you’re feeling fancy, winget uninstall Microsoft.Outlook does the job from Command Prompt without clicking through menus.

Reinstalling is where most people trip up. Download Outlook fresh from Microsoft’s official site (not some random link), and during setup, choose a clean install—this wipes away any leftover junk from the old version.

Your license should transfer automatically if you’re using a work or school account, but if it’s personal, you might need to re-enter your credentials.

The whole process takes about 15 minutes if you’ve prepped right, and you’ll end up with a faster, cleaner Outlook that doesn’t drag like a Windows 95 app.

Here’s where it gets interesting—if your data won’t import after reinstalling, it’s usually because the old profile folder (hidden deep in %appdata%) got left behind. I’ve seen this happen more than I’d like, so I always double-check by deleting the Outlook folder in C:\Users\[YourName]\AppData\Roaming\Microsoft before reinstalling.

It’s a small step that saves hours of frustration later. Ready to dive in?

What you need

Step-by-Step instructions for removing and reinstalling Outlook completely

Here's the exact method I use to purge Outlook and restore it fresh—no leftover files or corrupted profiles.

Before you begin, close all Outlook windows completely. Open the Outlook app one final time to locate your account settings—you'll need the email address and password for the primary account you use. Write these down or keep them handy in a text file.

Navigate to File > Account Settings > Account Settings. Here you'll see all email accounts configured. Make a note of any additional accounts (work, personal) and their server types (IMAP, POP3, Exchange). This ensures you can reconnect them after reinstallation without losing access.

If you use Outlook with Office 365, also note whether you're using the Microsoft 365 version or the standalone Outlook 2019/2016. This determines which installer you'll need later.

Open the Control Panel on your Windows PC. You can find it by searching in the Start menu or typing control panel in the Run dialog (Win + R). Navigate to Programs > Programs and Features.

Locate Microsoft Outlook in the list of installed programs. Right-click it and select Uninstall. If you're using Microsoft 365, you may see multiple entries—uninstall Microsoft 365 or Microsoft Office instead. Follow the on-screen prompts to complete the uninstallation.

After uninstalling, restart your computer. This ensures all background processes related to Outlook are terminated, preventing any lingering conflicts during the reinstall.

Open File Explorer and navigate to C:\Users\[YourUsername]\AppData\Local\Microsoft\Outlook. Delete any files or folders in this location. If you can't see the AppData folder, enable hidden files in File Explorer's View settings.

Next, press Win + R, type regedit, and press Enter to open the Registry Editor. Navigate to HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook (or 15.0 for Outlook 2013/2016). Right-click the Outlook folder and select Delete. Confirm the deletion when prompted.

Here's the thing—some leftover registry keys might still exist under HKEY_LOCAL_MACHINE. Search for Outlook in the Registry Editor and delete any remaining entries. Be cautious here: only delete keys related to Outlook, not system-critical entries.

Visit the Microsoft Office website or the Microsoft 365 portal to download the latest version of Outlook. If you're reinstalling a standalone version (like Outlook 2019), download the installer directly from the Microsoft website.

Run the installer and follow the prompts. When prompted to sign in, use the email address and password you noted earlier. If you're reinstalling Microsoft 365, you may need to sign in with your Microsoft account.

During setup, you'll have the option to customize your installation. Select Outlook as the only application to install—this ensures no unnecessary Office components are added, keeping your system clean.

After installation completes, open Outlook. You'll be prompted to add an account. Enter the email address and password for your primary account. Outlook should automatically detect the server settings (IMAP, POP3, or Exchange) and connect.

For any additional accounts you noted earlier, go to File > Add Account and manually reconnect them. If Outlook doesn't auto-detect the settings, you may need to enter them manually—use the same server details you noted during Step 1.

Send a test email to yourself to verify that everything is working correctly. Check your inbox and sent items to ensure no data is missing. If you encounter issues, revisit the account settings and double-check the server details.

Tips & tricks for perfectly clean Outlook reinstallation

Here's what I've learned from years of helping people completely purge Outlook—these tricks save hours of frustration.

Backup First: Before making any changes, create a backup of your Outlook data file (.pst). Use File > Open & Export > Import/Export to create a backup file. This ensures you can restore emails, contacts, and calendar entries if anything goes wrong during the reinstall. I've seen too many people skip this step and lose important data permanently.

Registry Cleanup Caution: When deleting registry entries in Step 3, take extra care in the HKEY_LOCAL_MACHINE section. Only delete keys that explicitly contain "Outlook" in their name. I once accidentally deleted a key related to Windows Update, which caused major system issues. If you're unsure, make a backup of the registry first using File > Export in Registry Editor.

Custom Installation Tip: During Step 4, when prompted to customize your installation, uncheck every box except Outlook. This prevents unnecessary Office components from installing, which can slow down your system and create future conflicts. I've seen people accidentally install the entire Office suite when they only wanted Outlook, leading to unnecessary bloat.

Test Connection Strategy: After reconnecting accounts in Step 5, don't just send one test email. Try sending to multiple accounts (personal, work, social media) and check if you receive emails from different senders. This helps verify the full functionality of your Outlook setup. I once had a user who thought their Outlook was working fine until they realized they couldn't receive work emails due to server misconfiguration.

Frequently asked questions

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

Wrapping up and next steps

Uninstalling and reinstalling Outlook doesn’t have to be a headache—with the right steps, you can reset your app cleanly and ensure smooth performance. Whether you’re troubleshooting errors or upgrading, this guide gave you the tools to remove old data safely and start fresh. 🎉

Now that you’ve mastered the process, take the next step: explore Outlook’s latest features or set up your account with a fresh configuration for even better efficiency. You’ve got this! 🚀