A collegaue of mine, Björn, recently set up a new SharePoint farm and noticed that some users saw the account name in the welcome drop-down you have in the top right corner.

This is bacuse there is a “IsActive” field that is default set to false. This field is used by the sync to know if it should pull the information from My Site or not.

If the users for instance add a document to the siten and you then perform a:

stsadm -o sync

The sync command starts the Quick Profile Synchronisation and then pushes the new information out to the site.

Andrew Woodward has an excelent post on this found here: http://www.21apps.com/sharepoint/user-profiles-why-do-my-changes-not-show-in-other-sites/