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Provider dynamic-link libraries (DLLs) are usually used by add-ins or as standalone integrations to change or extend Microsoft Outlook functionality, such as the Address Book. However, attackers can also use DLLs to compromise computer or network security. To help increase security, MAPI now blocks Provider DLLs from being loaded if they are registered incorrectly. Whenever possible, you should register a Provider DLL by using MapiSvc.inf, as described in File format of MapiSvc.inf. However, registering a Provider DLL may not always be possible. For example, add-ins may automatically register a Provider DLL during the installation process, or out-of-support add-ins may not register a Provider DLL correctly and cannot be fixed. This article describes the symptoms that you may experience if a Provider DLL is registered incorrectly, and provides a workaround to let MAPI load a Provider DLL if the DLL cannot be registered correctly. This article contains information that shows how to help reduce security settings or how to turn off security features on a computer. You can make these changes to work around a specific problem. Before you make these changes, we recommend that you evaluate the risks that are associated with implementing this workaround in your particular environment. If you choose to implement this workaround, take any appropriate additional steps to help protect your system. SymptomsYou may experience the following symptoms if MAPI blocks a Provider DLL. Symptom 1You receive an error message that resembles the following: An unexpected error has occurred. MAPI was unable to load the information service Additionally, Outlook generates one or more error level entries in Windows Event Viewer. This event log entry includes the path of the Provider DLL that is blocked. This log entry also includes a link to more information about how to correctly register the Provider DLL through MapiSvc.inf. Symptom 2The functionality that is provided by the DLL is no longer available. You may see unexpected behavior or additional error messages, depending on which functionality is affected. Notes
WorkaroundImportant We do not recommend that you apply this workaround because it may make your computer or network more vulnerable to attack by malicious users or by malicious software such as viruses. We recommended that the Provider DLL be registered through MapiSvc.inf to help protect the computer and network. For more information about how to register Provider DLLs correctly, see File format of MapiSvc.inf. Note There are specific conditions in which this workaround enables a Provider DLL to be loaded:
If these conditions are not met, this workaround cannot be used, and the Provider DLL should be registered through MapiSvc.inf. Warning:
More informationThis article applies only to Office 365 subscription versions of Office or Outlook. It does not apply to the following Office versions:
On these versions, MAPI will do some security checks but will not strictly enforce the same requirements. Need more help?Want more options?Explore subscription benefits, browse training courses, learn how to secure your device, and more. Communities help you ask and answer questions, give feedback, and hear from experts with rich knowledge. |