Outlook stuck on "Loading Profile" or not responding: step-by-step fixes

If classic Outlook freezes on the "Loading Profile" splash screen or turns white with "Not Responding" in the title bar, work through four checks in order: start Outlook in safe mode, disable COM add-ins, repair Office, and test a new profile. These follow Microsoft's published troubleshooting steps for Outlook that hangs or crashes with Microsoft 365. Most hangs end at one of the first three steps, and none of them touches your mail.

Who this is for and what you will have at the end

This guide is for anyone using classic Outlook for Windows, the version that has File > Options > Add-ins and a Mail item in Control Panel, on Windows 11 with a Microsoft 365 or Exchange account. It also suits the person who gets the call when a colleague's Outlook will not open. The steps are written for a single PC; admin-level fixes such as policy changes are out of scope.

By the end you will know whether the cause is an add-in, damaged Office files, a damaged profile or a damaged data file, and you will have Outlook opening again with your mail intact. If you use the new Outlook for Windows (the app with a toggle in the corner), these steps do not apply; read New Outlook for Windows admin controls instead.

What "Loading Profile" actually means

Outlook shows the Loading Profile dialog while it opens your mail profile, loads add-ins and opens the data files for your accounts. If any of those stalls, the dialog never closes. Microsoft's own page for this symptom describes it as the program hanging or stopping "when the Loading Profile dialog appears".

Because three different things happen during that moment, the fix is a process of elimination rather than one magic setting. Each step below removes one suspect.

Before you start

1. Close Outlook completely. In Task Manager (Ctrl+Shift+Esc), if Outlook is listed as "Not responding", select it and choose End task, so the next start begins clean.
2. Install pending updates. Microsoft's Outlook troubleshooting page says to "Check for Microsoft 365 or Office updates as well as Windows updates", and to include optional updates. A restart after updating is often enough on its own.
3. Note whether you use a local .pst file. Outlook shows them under File > Account Settings > Account Settings > Data Files if it will open at all. If you cannot open Outlook, search File Explorer for *.pst and copy any files you find to another folder before you change anything.

Step 1: Start Outlook in safe mode

Safe mode starts Outlook without its COM add-ins, so it separates add-in problems from everything else.

1. Press the Windows logo key + R to open the Run box.
2. Type the following and select OK.

outlook.exe /safe

3. If a Choose Profile box appears, accept the default and select OK. Enter your password if prompted.

What the result means:

• Outlook opens in safe mode. An add-in, or a setting that safe mode bypasses, is the likely cause. Go to Step 2.
• Outlook still hangs in safe mode. Add-ins are probably not the cause. Skip to Step 3 (repair Office).

These instructions apply to classic Outlook only.

Step 2: Find the add-in that causes the hang

With Outlook open in safe mode, disable the add-ins, then bring them back one at a time.

1. In Outlook, open the File menu, select Options, and then select Add-ins.
2. At the bottom, next to Manage, choose COM Add-ins and select Go.
3. Write down the names of the add-ins that are ticked. Do not select Remove; Microsoft's page says to disable add-ins rather than remove them.
4. Clear all the check boxes in the list and select OK.
5. Close Outlook and start it normally from the Start menu.
6. If Outlook now opens without hanging, return to File > Options > Add-ins > COM Add-ins > Go, tick one add-in, select OK, and restart Outlook. Repeat until the hang returns. The last add-in you ticked is the cause.

Once you know the add-in, update it from the vendor, or leave it disabled if you do not need it. If the COM Add-ins list is empty and the hang continues, move on to Step 3.

Step 3: Repair Microsoft 365 Apps

A damaged Office installation can stall Outlook before any add-in loads. Repair runs for the whole suite, even if only Outlook misbehaves.

1. Right-click the Start button and select Installed apps.
2. Find your Microsoft 365 or Office product, select the ellipsis (...) next to it, and select Modify.
3. In the window asking how you would like to repair your programs, choose Quick Repair first. Microsoft describes it as the faster option that detects only corrupted files and replaces them.
4. Follow the on-screen instructions, then try Outlook again.
5. If the hang remains, repeat and choose Online Repair, then Repair. This is the more thorough option and takes longer. You might need to restart the PC afterward.

Save open work in other Office apps first, because Office apps close during repair.

Step 4: Test with a new Outlook profile

A profile stores which accounts Outlook opens and where their data files are. If the profile is damaged, Outlook can hang while loading it. Adding a second profile tests that without deleting anything.

1. Close Outlook. Open Control Panel and select Mail.
2. Select Show Profiles.
3. Select Add.
4. In the Profile Name box, type a name, for example Test.
5. Enter the user name, the primary SMTP address (for example [email protected]) and the password, then select Next.
6. If you see "Allow this website to configure alias@domain server settings?", tick Don't ask me about this website again and select Allow.
7. Enter your credentials if asked, select OK, then select Finish when setup completes.

To open Outlook with the new profile without changing the default, close Outlook, hold Shift while you start it, and pick the new profile in the Choose Profile box. Microsoft's guidance is that if the new profile works, the original profile is likely corrupt.

Then decide:

• If the new profile works, you can make it the default from the Mail dialog. Wait until you have confirmed that all your mail, calendar and any .pst files are available before removing the old profile.
• Removing a profile also removes its associated data files, according to Microsoft. If you are not sure that those files are backed up or stored on a server, do not remove the profile.

Step 5: Check the data files

If Outlook hangs only with certain accounts, a data file may be damaged. Outlook stores mail in .pst and .ost data files.

Repair a .pst file with the Inbox Repair Tool

1. Back up the .pst file first. Microsoft recommends backing up your existing data file before you start the tool.
2. Close Outlook and open the Office16 folder. Microsoft's page lists C:\Program Files (x86)\Microsoft Office\root\Office16 for Outlook 2019 and 2016; on other builds the location can differ, so search for SCANPST.EXE if it is not there.
3. Open SCANPST.EXE, select Browse and choose the .pst file. Select Start to scan.
4. If errors are found, select Repair. The tool creates a .bak backup beside the original file.
5. Start Outlook with the profile that uses that data file.

Permanently deleted or badly damaged items may not be recoverable, so treat repair as a last step for local-only mail.

Recreate the .ost for an Exchange or Microsoft 365 account

For Exchange accounts, Microsoft says you can delete the offline .ost file and Outlook recreates it the next time it opens. The mailbox itself stays on the server. Download time depends on mailbox size and your connection.

Step 6: Run Microsoft's diagnostic tools

If the manual steps do not fix it, Microsoft's crash and hang article lists two Windows tools.

1. The Classic Outlook Connectivity troubleshooter, which Microsoft says works only on the PC where classic Outlook is installed and on Windows 10 or later.
2. The Microsoft Support and Recovery Assistant. On the first screen select Outlook, then Next, and choose "Outlook keeps hanging or freezing". It runs checks and suggests fixes.

The Classic Outlook Advanced Diagnostics troubleshooter creates a detailed configuration report if you need to hand details to a support engineer. None of these tools work in new Outlook for Windows.

Step 7: Consider the graphics driver

Microsoft's display-issues page says hardware acceleration is turned off automatically in safe mode, and that Office relies on up-to-date, compatible display drivers. So if Outlook opens in safe mode but all add-ins check out clean and a repair did not help, graphics are worth a look.

1. Open Settings > Windows Update and select Check for updates.
2. Select Advanced options > Optional updates and install any display driver update that is offered. If none is offered, check your PC or graphics card manufacturer's support site.
3. If the hang continues, in Outlook choose File > Options > Advanced and look for the Disable hardware graphics acceleration option in the Display group, then restart Outlook.

An archived Microsoft article about Outlook 2013 documents this exact symptom: a hang at Loading Profile on PCs with two video cards where the Disable hardware graphics acceleration option was not selected. It is not a current Microsoft 365 article, so treat it as a clue for unusual hardware rather than a likely cause on a typical PC. That article's registry workaround targets Office 2013 and is not repeated here.

Verification

After each step, confirm that Outlook is really healthy rather than just open:

• Outlook starts from the Start menu without safe mode, and the Loading Profile dialog closes by itself.
• The title bar does not show "Not Responding" while you switch folders.
• Send and receive a test message to your own address.
• Check Data Files under File > Account Settings and confirm every data file you expect is listed.
• If you removed add-ins, confirm that the tools you need still work.

Troubleshooting common outcomes

Closing checklist

1. Close any frozen Outlook process and install Windows and Office updates.
2. Run outlook.exe /safe.
3. Disable COM add-ins and re-enable them one at a time.
4. Run Quick Repair, then Online Repair if needed.
5. Add a new profile and test it with Shift at startup.
6. Back up, then check the data files.
7. Run Support and Recovery Assistant if nothing has worked.
8. Update the display driver if safe mode works but nothing else explains the hang.

If Outlook opens but keeps asking you to sign in, read Outlook keeps asking for password. If it opens but cannot reach the mailbox, see Outlook Autodiscover troubleshooting for Microsoft 365.

What we checked

• Opened Microsoft's "Troubleshoot Outlook for Windows issues" page on support.microsoft.com on 2026-11-14 and copied the exact wording for safe mode (outlook.exe /safe), the File > Options > Add-ins > COM Add-ins > Go path, and the instruction to disable rather than remove add-ins.
• Opened the learn.microsoft.com article "Outlook crash or stop responding when used with Microsoft 365" on 2026-11-14 (page dated 2024-01-24) and cross-checked its safe mode, COM add-in and new-profile steps against the support.microsoft.com page. The two agree; the Learn page adds the Control Panel > Mail > Show Profiles > Add path and the Support and Recovery Assistant option "Outlook keeps hanging or freezing".
• Opened the archived Learn article for KB 2957336 on 2026-11-14 to confirm what Microsoft documents for the Loading Profile symptom. It applies to Outlook 2013 and a graphics-hardware cause only, so we did not present its registry change as a fix.
• Opened Microsoft's "Display issues in Office client applications" page on 2026-11-14 and confirmed that hardware acceleration is disabled when an app starts in safe mode.
• Opened Microsoft's "Repair an Office application" page on 2026-11-14 and quoted the Windows 11 path: Installed apps > ellipsis > Modify > Quick Repair or Online Repair.
• Opened Microsoft's "Repair Outlook data files (.pst and .ost)" page on 2026-11-14 and confirmed the SCANPST.EXE path listed for Outlook 2019 and 2016, the Browse, Start and Repair buttons, and the .bak backup behavior.
• Not tested on a live PC or tenant; steps follow Microsoft's documentation as of 2026-11-14. The Settings > Windows Update > Advanced options > Optional updates path and the Disable hardware graphics acceleration location in Outlook options (File > Options > Advanced > Display) were not opened on a current Microsoft page in this run, so confirm the labels on your build.

Last tested: 2026-11-14

References

• Troubleshoot Outlook for Windows issues
• Outlook crash or stop responding when used with Microsoft 365
• Outlook 2013 stops at the Loading Profile screen (archived, KB 2957336)
• Display issues in Office client applications (archived)
• Repair an Office application
• Repair Outlook Data Files (.pst and .ost)