Hi Check this link
http://support.microsoft.com/default.aspx?scid=kb;en-us;198088&Product=out2K
OL2000: (IMO) How To Password Protect a Personal Folder (.PST)
View products that this article applies to.
This article was previously published under Q198088
NOTE: These procedures only apply if you have installed Outlook with the
Internet Mail Only option. To determine your installation type, click About
Microsoft Outlook on the Help menu. If you have the Internet Mail Only
option installed, you see "Internet Mail Only".
For information about the differences between Microsoft Outlook and
Microsoft Outlook Express e-mail clients, click the following article
number to view the article in the Microsoft Knowledge Base:
257824 OL2000: Differences Between Outlook and Outlook Express
SUMMARY
In Microsoft Outlook it is possible to prevent others from accessing your
mail, contacts, and calendars by assigning a password to your personal
folders.
MORE INFORMATION
To add a password to your personal folders follow these steps:
If the Folder List is not visible, then click Folder List on the View menu.
Right-click "Outlook Today - [Personal Folders]", and then click Properties
For "Personal Folders" on the shortcut menu.
On the General tab, click Advanced.
Click Change Password.
In the Change Password dialog box, type your new password and verify it by
typing it a second time.
Make sure that the "Save this password in your password list" check box is
cleared (not checked). This prevents the password from being cached. You
will need to type it each time you run Outlook.
After you have entered the password successfully, click OK three times.
The next time you start Outlook, you will be prompted to type a password
before viewing the contents of the personal folder.
Subbu
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