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Determine which third-party DLLs are currently running under the Outlook.exe process

  • 适用于: Outlook for Microsoft 365, Outlook 2021, Outlook 2019, Outlook 2016

Third-party add-ins or other software on your computer can potentially cause problems in Microsoft Outlook. To determine which third-party DLLs are currently running under the Outlook.exe process, follow these steps:

  1. Start Outlook.

  2. Run Sysinternals Process Explorer (procexp.exe). In Process Explorer:

    1. Enter "outlook.exe" in the top-right search box.

    2. Select the OUTLOOK.EXE process.

    3. Select View > Show Lower Pane to show the lower pane.

    4. Select View > Lower Pane View > DLLs to list the DLL files that run under the Outlook.exe process.

    5. In the lower-pane, right-click on any column header, select the Select Columns > DLL > Version checkbox, and then select OK.

    6. Select File > Save As > Save to save the lower-pane data to a tab-delimited text file.

  3. In Microsoft Excel:

    1. Select File > Open, and then select the tab-delimited text file to open the Text Import Wizard.

    2. In the Text Import Wizard, accept the default options, and then select Finish.

    3. On the row that contains the Name, Description, Company, Path, and Version column headers:

    4. Right-click the Name cell and add a filter to only show values that contain ".dll". The filtered list contains all Microsoft and third-party DLLs that run under the Outlook.exe process.

    5. Right-click the Company Name cell and add a filter to exclude values that contain "Microsoft". The filtered list now only contains third-party DLLs and possibly some DLLs that have an empty value in the Company Name column.

  4. In Outlook:

    1. Select File > Options > Add-ins to display a list of add-ins.

    2. For each active add-in in the list:

      1. Select the add-in. This displays the add-in Publisher and Location values under the list.

      2. Compare the add-in file name (specified in the Location value) to the name of each DLL that has an empty Company Name value in your filtered list from step 3e. If you find a match, enter the Publisher value as the Company Name value. If you enter "Microsoft", reapply the filter from step 3e to exclude the Microsoft DLL from the filtered list.

      The filtered list now contains only the third-party DLLs that are currently running under the Outlook.exe process.