Outlook Calendar Folders APLZOD64.dll error

Hello RogertheSquirrel,

Thank you for trying this steps and getting back to us. Since this issue is with Outlook and the steps provided are from a Microsoft article, we would recommend using the information from that Microsoft support link for more assistance.

Fixes or workarounds for recent issues in Outlook for PC

Best regards.

Hello RogertheSquirrel,

Here's the workaround for that error:

iCloud fails to load properly in Outlook 2007, Outlook 2010, Outlook 2013 and Outlook 2016.

When accessing Calendar, Contacts, or Tasks, you get the following error:

The set of folders cannot be opened. MAPI was unable to load the information service C:\PROGRA~2\COMMON~1\Apple\Internet Services\APLZOD.dll. Be sure the service is correctly installed and configured."

STATUS: WORKAROUND

The loading of unregistered MAPI services has been disabled by default to make Outlook more secure.

If you're using Outlook 2010, Outlook 2013 or Outlook 2016, uninstall and re-install iCloud to resolve this issue. For more information, see this page.

For Outlook 2007, use the workaround below:

Warning: This workaround may make your computer or your network more vulnerable to attack by malicious users or by malicious software such as viruses. Microsoft does not recommend this workaround but is providing this information so that you can choose to implement this workaround at your own discretion. Use this workaround at your own risk.

If you have trusted applications that depend on being loaded in this manner, you can re-enable those applications by setting the following registry key:

REG_DWORD HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\Security\AllowUnregisteredMapiServices

You can use the following registry subkey to apply the registry setting as a domain policy:

HKCU\Software\Policies\Microsoft\Office\12.0\Outlook\Security\AllowUnregisteredMapiServices

Value 0 (default): Block loading of unregistered MAPI services. This is the recommended setting to avoid unexpected execution of unknown code.

Value 1: Enable loading of unregistered MAPI services.

Important: The following steps show you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Please make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, see this article.

To make these registry changes, follow these steps:

1. Click Start, click Run, type regedit in the Open box, and then click OK.

2. Locate and then click the following subkey in the registry:

HKCU\Software\Microsoft\Office\12.0\Outlook\Security\

3. On the Edit menu, point to New, and then click DWORD Value.

4. Type AllowUnregisteredMapiServices for the name of the DWORD, and then press Enter.

5. Right-click AllowUnregisteredMapiServices, and then click Modify.

6. In the Value data box, type 1 to enable the registry entry, and then click OK.

Note: To disable the AllowUnregisteredMapiServices setting, type 0 (zero), and then click OK.

7. Exit Registry Editor, and then restart the computer.

Vulnerability information (applies to all versions)

MAPI does not validate that a provider’s DLL that it is requested to load is registered correctly in MapiSVC.inf or even that it comes from the local machine. This can be exploited by creating a file together with an OLE object in such a way to cause MAPI to load a DLL from a network share when the OLE object is activated. This can allow arbitrary code execution to occur.

Fixes or workarounds for recent issues in Outlook for PC

Cheers!