Error 0x8007007A while downloading offline address book in Outlook


Some Microsoft 365 users may receive the error code 0x8007007A when you try to download a Offline Address Book (OAB) for a profile in Outlook on a Windows 11 or Windows 10 computer. If you are affected by this problem, this article is intended to help you with the most appropriate solutions that you can apply to quickly correct this error.

You will encounter this error when the .prf (profile) Where .msp (customization) that you used to configure an Outlook profile was created using the Office Customization Tool (OPO), and you select the Enable offline use option, but you did not specify the directory path to store the offline address book files.

Error 0x8007007A while downloading offline address book in Outlook

So, if you are facing this Outlook issue, then you can try any of the solutions recommended below in no particular order to resolve the issue. error 0x8007007A while downloading offline address book in Outlook on your Windows 11/10 PC.

  1. Check the directory path of the OAB file
  2. Create a new Outlook profile
  3. Modify the registry

Let’s take a look at the description of the process involved regarding each of the solutions listed.

1]Check the directory path of the OAB file

To fix error 0x8007007A while downloading offline address book in Outlook on your Windows 11/10 PC, this solution requires you to check the directory path of the OAB file, depending on the version of Outlook you have installed on your computer.

TO check directory path of OAB file for Outlook 2013, do the following:

Check the directory path of the OAB-Outlook 2013 file

  • In the Office 2013 OCT, click Add accounts under the Outlook section.
  • Click on Add Where To modify the account to configure.
  • Click on More settings.
  • On the Cached mode tab, select the Configure Cached Exchange Mode option.
  • Select the Use Cached Exchange Mode option.
  • Select the Customize the location of the .ost and .oab files option.
  • Check the Directory path for storing offline address book files text zone.

Now do one of the following and click on the Okay button:

  • Enter a valid path in the Directory path for storing offline address book files text zone.
  • Clear the Customize the location of the .ost and .oab files option.

TO check directory path of OAB file for Outlook 2010, do the following:

Check the directory path of the OAB-Outlook 2010 file

  • In the Office 2010 OCT, click Add accounts under the Outlook section.
  • Click on Add Where To modify the account to configure.
  • Click on More settings.
  • On the To exchange tab, select the Enable offline use option.
  • Check the Directory path for storing offline address book files text zone.

Now do one of the following and click on the Okay button:

  • Clear the Enable offline use option.
  • Enter a valid path in the Directory path for storing offline address book files text zone.

2]Create a new Outlook profile

This solution requires that you create a new Outlook profile. To do this, follow the instructions in the guide to fix the error 0x8004010F, Unable to access Outlook data file.

3]Modify the registry

Edit registry - Delete registry key 001e660e

Outlook cannot store OAB files properly and the display error may occur if the value data for the 001e660e the registry entry is missing. The registry entry in question is used to control where OAB files are stored by Outlook – this solution requires you to delete the registry entry.

Since this is a registry operation, it is recommended that you back up the registry or create a system restore point as necessary precautionary measures. Once done, you can proceed as follows:

  • hurry Windows key + R to call up the Run dialog box.
  • In the Run dialog box, type regedit and press Enter to open Registry Editor.
  • Navigate or navigate to the registry key path below depending on the version of Outlook installed on your Windows 11/10 PC. Replace the placeholder with your actual Outlook profile name.

For Outlook 2013:

HKEY_CURRENT_USERSoftwareMicrosoftOffice15.0OutlookProfiles

For Outlook 2010:

HKEY_CURRENT_USERSoftwareMicrosoftWindows NTCurrentVersionWindows Messaging SubsystemProfiles
  • At the location, click the Edit menu.
  • To select Find.
  • Now enter 001e660E in the search field to search for the registry key.
  • To select Find next.

When the result is displayed, make sure the registry key is listed under the correct one subkey. You can consult the data of the 001e660E registry value, and if it is empty, it is the culprit for the OAB download problem.

  • Now right click on the registry key and select Wipe off from the context menu.

If you are unable to delete the registry key, you can take ownership of the registry key and try the delete operation again.

  • Exit Registry Editor when you are finished.
  • Restart the PC.

That’s it!

Similar article: How to restore contact information to address book in Outlook

How do I force the download of an offline address book?

To force the download of an offline address book in Outlook, follow these steps: On the Tools menu, point to Send / Receive, and then click Download the address book. In the Offline Address Book dialog box, check the option to Download the changes since the last send / receive. Click on Okay.

How can I troubleshoot Outlook offline address book in an Office 365 environment?

To troubleshoot Outlook offline address book issues in an Office 365 environment, try the following suggestions:

  • Make sure that the Global Address List (GAL) is up to date.
  • Manually download the offline address book, and then make sure Cached Exchange Mode is turned on.
  • Make sure that the Background Intelligence Transfer Service (BITS) is running on your Windows 11/10 PC.

Why does Outlook use the Offline Address Book by default?

The main reason that Outlook defaults to Offline Address Book is that the default configuration of an Outlook client is to use Cached exchange mode. In Cached Exchange Mode, the default is to use the OAB, as it is more responsive than the online version.


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