0x8007007A error when you try to download an Offline Address Book in Outlook 2013 or Outlook 2010

  • Article
  • Applies to:
    Outlook 2013, Microsoft Outlook 2010

Original KB number:   3031401

Symptoms

When you try to download an Offline Address Book (OAB) for a profile in Outlook 2013 or Outlook 2010, you receive the following error message:

Task '<profile name>' reported error (0x8007007A): 'Unknown Error 0x8007007A'.

Resolution Method 1 - Create a new Outlook profile

  1. Exit Outlook.
  2. In Control Panel, select Mail, and then select Show Profiles.
  3. On the General tab in the Mail dialog box, select Add.
  4. In the New Profile dialog box, type a new profile name, and then select OK.
  5. In the Add New Account dialog box, type your email account information, and then select Next.
  6. After your account is successfully configured, select Finish.
  7. Select Always use this profile, select the new profile, and then select OK.

Resolution Method 2 - Delete the 001e660e registry value

Important

Follow the steps in this section carefully. Serious problems might occur if you modify the registry incorrectly. Before you modify it, back up the registry for restoration in case problems occur.

To manually delete the 001e660e registry value, follow these steps:

  1. Exit Outlook.

  2. Start Registry Editor:

    • In Windows 7, Select Start, type regedit in the Search programs and files text box, and then select regedit.exe in the search results.
    • In Windows 8, move your mouse to the upper-right corner, select Search type regedit in the search text box, and then select regedit.exe in the search results.

  3. Locate and then select the following registry subkey for your version of Outlook:

    • Outlook 2013

      HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Outlook\Profiles\<profile name>

    • Outlook 2010

      HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\<profile name>

  4. On the Edit menu, select Find.

  5. Enter 001e660E and then select Find Next.

    Screenshot of the Find dialog box of Registry Editor.

  6. When a result is found, make sure that it is listed under the correct <profile name> subkey.

    Note

    View the data of the 001e660E registry value to determine whether it is blank. If it is blank, this confirms the cause of the OAB download issue.

  7. Right-click the 001e660E registry value, and then select Delete.

    Screenshot of the right-click menu of the 001e660E registry value.

More information

Value data for the 001e660e registry entry is used to control where the OAB files are stored by Outlook. If the value data for the 001e660e registry entry is missing, Outlook cannot store the OAB files successfully. The registry entry is located in the following registry subkey.

  • Outlook 2013

    HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Outlook\Profiles\<profile name>\<subkey varies for each Outlook profile*>\

  • Outlook 2010

    HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\<profile name>\<subkey varies for each Outlook profile>\

Note

  • To determine the subkey that varies for each Outlook profile, search the <profile name> subkey for the 001e660e registry entry. To do this, see method 2 in the resolution section.
  • The registry value does not exist by default in most Outlook profiles. It typically exists only if you have configured an Outlook profile by using a .prf file that has the setting that specifies the path for the OAB files.
  • If you configure an incomplete .prf or .msp file in Outlook 2010 or Outlook 2013, this may cause a blank value for the registry key. For more information, see (KB2923056) 0x8007007A error when you try to download an Offline Address Book because of an incomplete .prf or .msp file.