The update tab is missing in Java Control Panel while logged on as a standard user. This problem was fixed in mustang build b85 and could not be reproducible on vista beta build 5365 (see bug id - 6406821)

However, the bug is again reproducible on vista beta build 5381.

To reproduce :

On Vista beta build 5381,
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Install mustang PIT build 85 jre from the following location http://j2se.east/plugin/1.6.0-pit/2006-05-10.14_38/windows-i586
You need to be administrator to install the jre

Log out and log back in as a standard user

Invoke Java Control Panel

"Update" tab is missing.
This problem is not specific to b5381 and is due to security settings on Vista.

Steps to reproduce -

In a Vista machine, turn off the User Account Control. You can access it as follows:
Control Panel -> User Accounts -> Change Security Settings

Now install the JRE using an account with administrator privileges.

Log out and log back in with standard user account

Invoke the Java Control Panel and the update tab is missing. All the other tabs are present.

Note - If the User Account Control is turned on, the Update tab is visible for the standard user.