View and modify MAPI properties (metadata) of messages and folders to fix sync or display errors.
To confirm you are running the correct version:
The most important rule for MFCMAPI is that its architecture , not your Windows operating system. mfcmapi download 64 bit
After download, verify the file integrity using PowerShell:
After installation, you’ll find shortcuts in the Start Menu under “MFCMAPI”. View and modify MAPI properties (metadata) of messages
| Problem | Likely Cause | Solution | |---------|--------------|----------| | “Failed to logon (MAPI_E_VERSION)” | MAPI bitness mismatch | Uninstall 32‑bit MFCMAPI, install 64‑bit version. | | “MAPI cannot load profile” | Outlook closed incorrectly | Reboot, then launch MFCMAPI before Outlook. | | “No profiles found” | 64‑bit MFCMAPI cannot see 32‑bit Outlook profiles | This is correct – you cannot mix bitness. Install 32‑bit MFCMAPI instead. | | Crash on property display | Corrupt extended MAPI property | Use and retry. |
Look for "32-bit" or "64-bit" in the top line of the pop-up window. Where to Download MFCMAPI 64-Bit | Problem | Likely Cause | Solution |
For full access to certain protected mailbox features, right-click the executable and select Run as administrator . Key Capabilities of MFCMAPI GitHubhttps://github.com microsoft/mfcmapi - GitHub