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mozmapi32.dll - Analyze and How to Fix Errors

★★★★☆ Verified File (27.08.2026)

⚠️ Important Notice: Discover details about mozmapi32.dll, its function in Windows systems, and troubleshooting tips. Manually replacing system libraries can brick future Windows updates or cause critical system failures.

Architecture:32-bit (x86)Compatible with 32 and 64-bit Windows
Creation date23.05.2025 00:42:12
File version0.8.0.0
Antivirus scan✅ Clean No viruses detected.
Digital signature🟡 Not signedSignature missing. The file may have been modified.
Hash Integrity✅ MD5: VerifiedFile Hash protection is missing.
File size84 kb.86016 bytes.

Hashes:

MD5: 8059620b498c8d404e8c34957294f2e2 ✅
SHA-1: cf6b9086b4ba8eabb57802edc721c507fd65fc28
SHA-256: c950caca2fe6ec00209c7bea715549337c30b2d20592fe6e2166c616e1ede093
SHA-512: ca843d606add3adb4ba36ba5d9d0ecb11313c8fd13253bb320c5de9899b9d63e54b3f3cc2f6405457543bf2d67e7b990f36000ae32ad0d16ab11d73c190453e7

✅ This file is compatible with 32-bit Windows and can run on ✅ 64-bit Windows (via the WOW64 subsystem).

How to Fix Mozmapi32.dll Errors Without Downloading

You can fix mozmapi32.dll errors without downloading new files from risky DLL websites. This error usually happens when Microsoft Outlook conflicts with Mozilla software (like Thunderbird or Firefox) over the default email settings.

Here are the fastest ways to fix it:

1. Set Your Default Email Program

Windows gets confused when multiple apps try to use the same MAPI (Messaging Application Programming Interface) file.

  1. Press Windows Key + I to open Settings.
  2. Click on Apps and then select Default apps.
  3. Look for Email.
  4. Select Microsoft Outlook (or your preferred client) as the sole default.
  5. Restart your computer.

2. Rename the Corrupted File

Windows will automatically recreate a clean version of the file if you rename the broken one.

  1. Open File Explorer (Windows Key + E).
  2. Navigate to: C:\Windows\System32\
  3. Search for mozmapi32.dll.
  4. Right-click the file and select Rename.
  5. Change the name to mozmapi32.old.
  6. Restart your PC and open Outlook.

3. Repair Microsoft Office / Outlook

If the file is missing or corrupted, the built-in Office repair tool will restore it safely.

  1. Right-click the Start menu and select Apps and Features (or Installed Apps).
  2. Find Microsoft Office (or Microsoft 365) in the list.
  3. Click Modify or Advanced options.
  4. Choose Quick Repair (or Online Repair for a deeper fix).
  5. Click Repair and follow the prompts.

4. Run System File Checker (SFC)

This built-in Windows tool scans for and repairs corrupted system files automatically.

  1. Type cmd in the Windows search bar.
  2. Right-click Command Prompt and choose Run as administrator.
  3. Type sfc /scannow and press Enter.
  4. Wait for the scan to hit 100%, then restart your PC.

📊 Diagnostics Tool: Verify Your mozmapi32.dll File

Worried that the file on your PC has been modified by malware? Drop it into the form below. Our script will verify its file size, cryptographic hash (MD5/SHA-1), and check for a valid Microsoft digital signature.

Connected files:
ole32.dll
└── KERNEL32.dll