
Processor : Pentium Class
Operating System : Microsoft Windows 7/Vista/2003/XP/2000/NT4 (SP6)
Memory : Minimum 256 MB (512 MB recommended)
Hard Disk : 50 MB of free disk space
MS Outlook : MS Outlook 2010/2007/2003/2002/2000
Internet Explorer : Version 5 or later
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Outlook "extend.dat file missing" rectification
Outlook is a extensively used personal information manager mail application generated by the Microsoft for its users. With the help of this application user can easily manage their email communication, calenders, journals, notepads, attachments, tasks and other important data which have been stored in the outlook. With the help of this mail management application it have become easier for the user to manage their mails without contacting to the server each time. extend.dat file is used by the Outlook to allow the cache registry entries for the third party add-ins like a contact-verification program. In some cases when a change occurs in the outlook, it start giving extend.dat missing error to the user and turns out to be annoying many times.
User have to suffer a freezed or inaccessible outlook with the pop up error message like:
"An extension failed to initialize. Cannot open file: extend.dat. The file may not exist, you may not have permission to open it, or it may be open in another program. Right-click the folder that contains the file, and then click Properties to check your permissions for the folder. You don't have appropriate permission to perform this operation"
This extend.dat missing error is the result of the programing glitch in the Outlook software and is prevalent till Outlook 2003 series as the next version does not have these files. Apart from being a bit annoying it is easy to fix the error. In order to fix the extend.dat file missing problem in Outlook user need to
Open Outlook.
Click on the HELP menu located on the top of the screen.
Select "Detect and repair" from the options available in the Help menu.
Click on the START button to start the diagnose.
When Outlook finds the file rename it to solve the issue: -
Click START button at the bottom of your desktop which will open up the start menu. Then you need to force the outlook to create new file if the old one is not fixed in the diagnose.
Select SEARCH in the START menu.
Type "extend.dat" in the SEARCH box and let the program to perform the search.
Highlight the file in the right column as the Windows locate it.
Right Click on the file and select RENAME options in the menu which appears.
Type "extend.old" and hit Enter and the file has been renamed.
Now restart the Outlook and when outlook opens it will search for the file and when it will be unable to find it, it will automatically create a new one.
With the help of above mentioned steps you will be able to solve the issue of extend.dat missing file and will be able to restore the file back to its location and solve the error. If in any case you are not able to solve the issue with the help of above mentioned steps then the issue can be the result of any other PST or Outlook corruption which can be fixed with the help of Outlook repair tool. With the help of this repair tool you will be able to fix the entire outlook corruption and related issues.
Install the software with quick installation wizard. Just follow the wizard to successfully install the Outlook PST Repair.

Launch the Outlook PST Repair from the desktop shortcut. And select the corrupted PST file.

Click Next and follow the on-screen instruction to finish it. No need to Worry! Your Outlook.pst is in Hand of Professional.

Once Scanning process is completed, Outlook PST repair will show the previews of all the recoverable components.

After viewing the lost folder in the recovered item list. Go for the Licence key to save the pst file.
