According to Microsoft’s doc Creating Shared Hosting Solutions on Windows SharePoint Services 3.0 available at office.microsoft.com/download/afile.aspx?AssetID=AM102157711033
"Also note that account creation mode is a deprecated feature of Windows SharePoint Services 3.0. Although this feature is supported through version 3.0, the product team recommends that customers plan to move off of it at their earliest convenience."
We’ve yet to see if this will hold true, but for those of you using Account Creation mode, start plannig an alternative solution!
Account Creation Mode not in SharePoint Foundation – deprecated with WSS 3.0
