On a SharePoint 2010 installation we have a small number of users whose user profile URLs (i.e. click on their name in the list of users) goes to something like this:
These always result in a 'Page not found' error.
All other users, however, go to:
which works just fine.
1) Why is there a difference? As far as I can tell the users have been created in the same manner.
2) How does one sort out the Page not found error, other than enabling My Sites (which I don't want to do)?