Outlook, as we all know, is the personal information manager for Microsoft users. These elements of the Office suite offers email communication, calendar management, task, contact management, journals and notepad. This is an all in one package for managing your daily life. The Outlook caches the registry files for all its features and utilities especially for third party add-ins like Contacts verifying software. The ‘extend.dat’ file helps in saving the registry files. If this ‘extended.dat’ file gets corrupted or if any major change is brought to Outlook, errors can appear with the add-in programs. Sometimes the deletion of the add-in itself can cause errors.
Outlook tech support says that such programming malfunctions can be resolved by carrying out certain Outlook repair procedures. The issues are more often in Outlook 2003. This annoying issue can be fixed easily using the Outlook repair steps by the Outlook support team.
Outlook repair procedure for extend.dat file errors
- Open Outlook on the computer.
- Click on the Help menu from the top of the screen.
- Select Detect and Repair from the options in the help menu.
- Click on the button at the bottom of the screen to start the diagnostics and let it run.
- Click on the Start button at the bottom of your desktop. This will open the Start menu.
- Make Outlook create a new file if the diagnostic program does not fix the old one.
- Select the Search option from the Start menu.
- Type extend.dat in the search text box; allow the program to search and find the file on your hard drive.
- Once the search window locates it, highlight the file from the right pane on the search window.
- Right-click on the ‘extend.dat’ file and select Rename from the options that appear in the menu.
- Type extend.old and hit Enter; this will change the name of the file.
- Restart Outlook 2003 to create a new ‘extend.dat’ file.
When Outlook launches, it will automatically look for the ‘extend.dat’ file. Since it is renamed, the file will not be detected. This will force Outlook to create a new .dat file. This will fix the ‘extend.dat’ file error.
If the issue persists, contact Outlook tech support for help.