Outlook keeps re-indexing emails

I have a couple computers that keep re-indexing the index in outlook.
They are running Windows 7, Outlook 2010 and are fully up to date.
The email accounts are all using Microsoft exchange

Every few weeks the outlook search index seems to re-build itself automatically.
I have tried to manually re-index the computer but this issue still occurs.
Is there anyway to stop the emails from re-indexing automatically?

Any ideas?
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Ganesh Kumar ASr Infrastructure SpecialistCommented:
Refer this article which was posted earlier for the same type of issue : http://www.experts-exchange.com/Software/Office_Productivity/Groupware/Outlook/Q_26970638.html

Try the below steps :

1.  Checked and repaired .pst file with scanpst.exe
2.  Reboot laptop
3.  Launched Outlook 2010 , go to File tab
Select Options
Select Search
Click Indexing Options
Click Advanced
Click Rebuild
4.  After 10 hours or so, indexing was complete

Check if the indexing stops automatically if not try the following.

Manually re-build the search index.
1.    Click on Start and then on Run.
2.    Type cmd and hit Enter.
3.    Type the following command and press enter.
net stop wsearch
4.    Close the command prompt.
5.    Click on Start and then on run.
6.    %AllUsersProfile%\Application Data
\Microsoft\Search\Data\Applications\Windows and delete all the files and subfolders.
First backup your registry if you are going to modify the registry, her eis the how to article : http://windows.microsoft.com/en-US/windows7/Back-up-the-registry
7.    Open registry editor by typing regedit.exe from the run box.
8.    Delete the following registry keys:
- "HKLM\Software\Microsoft\Windows Search\Applications\windows"
- "HKLM\Software\Microsoft\Windows Search\CatalogName\windows"
- "HKLM\Software\Microsoft\Windows Search\Databases\windows"
- "HKLM\Software\Microsoft\Windows Search\Gather\windows"
- "HKLM\Software\Microsoft\Windows Search\Gathering manager\Applications\windows" - "HKLM\Software\Microsoft\Windows Search\UsnNotifier\windows"
9. In registry in key "HKLM\Software\Microsoft\Windows Search" switch "SetupCompletedSuccessfully" subkey to "0"
10.  Open the command prompt again and type the following command in order to start    windows search again.
net start wsearch
Restart the computer.

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