sorry still have not tried it yet but here is the update details
Microsoft SQL Server 2005 Express Edition Service Pack 3 (KB955706)
Download size: 55.7 MB
You may need to restart your computer for this update to take effect.
Update type: Important
This service pack upgrades all Microsoft SQL Server 2005 Express Edition instances and components to Service Pack 3 (SP3). If you need additional installation options, you should download this service pack at the Microsoft Download Center. For more information, see Microsoft Knowledge Base article 955706.
More information:
List of the bugs that are fixed in SQL Server 2005 Service Pack 3
Help and Support:
Microsoft Help and Support