Disabling mysite / mylinks on Sharepoint 2003 & MOSS 2007
No theory, just pure steps =)
1. Disabling mysite/mylinks on MOSS 2007
Step 1.
Visit “Central Administration”
Select “SharedServices” under “Shared Services Administration”
Step 2:
Under “User Profiles and My Sites”, select “Personalization services permissions”

Step 3:
This will open “Manage Permissions”.
Select appropriate user for which you want to disable “mysite” option.
In most cases you will have to use “NT AUTHORITY\Authenticated Users”. This will apply to all authenticated users. In my case I was using windows integrated security so I used this one.
Clicking the user will take you to the following screen.
Un-check the “Create personal site” option.
This should work for you. You may additionally un select the “Use personal feature” option as per your needs.
2. Disabling mysite / mylinks on SharePoint 2003 Server
Check following detailed link for 2003 server.
http://support.microsoft.com/default.aspx?scid=kb%3Ben-us%3B887921
But again there are 2 types.
1. Turning off My Site personal site and turn off views for members of a site group
2. Turning off My Site personal sites without affecting views for a site group
So first confirm which option you want to go first. Then only make changes.
Enjoy..

