How to Fix the Sbolext.dll Error

When opening Microsoft Outlook, you may receive one of the following error messages:

The add-in C:\PROGRA~1\hotbar\bin\499~1.0\SBOLExt.dll could not be installed or loaded.

The Add-In C:\Progra~1\Spambl~1\Bin\477~1.0\SBOLExt.dll could not be installed or loaded.

These error messages will affect your Outlook from opening properly.


Sbolext.dll related errors are caused by a Windows Anti-Spam program.


How to Fix Sbolext.dll Error

  1. Open Outlook.
  2. Go to Tools on the top of the page.
  3. Next, go to Options.
  4. Click on the Other tab.
  5. Now click on the Advanced Options button.
  6. A window will open.
  7. Click on Add-In Manager.
  8. Uncheck Windows Anti-Spam.
  9. Click OK on all open windows.
  10. Close Outlook.


You may use these variations if the above instructions do not remove the error for you.

  1. Make sure that Outlook is closed.
  2. Locate and delete the extend.dat file.
  3. Open Outlook.

Another option you can try is to uncheck Spam Blocker for MS Outlook. If the error occurs in conjunction with a redemption.dll error, you should also uncheck Redemption Helper Outlook Extension.

If you are on Microsoft Outlook 2007, the instructions are different as the location of Spam Blocker is different.

  1. Open Outlook.
  2. Go to Tools on the top of the page.
  3. Click on Trust Center.
  4. A window will open.
  5. Go to Add-ins.
  6. Go to the Manage box.
  7. Click on Exchange Client Extensions.
  8. Click Go.
  9. Uncheck Spam Blocker.
  10. Click OK.

Microsoft Office Outlook 2003 Solution Center has How-To articles, downloads and troubleshooting tips if you are using MS Outlook 2003.

If you are using MS Outlook 2007, you should go to the page for the Outlook 2007 Solution Center.