Using a wildcard inclusion managed path at the root of a web application in WSS 3.0 and MOSS 2007 has limited support, it is recommended to migrate the affected sites away from this structure.
Using a wildcard inclusion managed path at the root of a web application in SharePoint Foundation 2010 or in SharePoint Server 2010 is not supported. This configuration is not explicitly blocked by the user interface or the command line tools, however there are several features in the products which will not work properly in this configuration.
This configuration is not supported even if the web application is using classic Windows authentication and will not use claims authentication in the future.
It is not supported to in-place upgrade a WSS 3.0 or MOSS 2007 farm which has a root wildcard inclusion managed path, however this is not explicitly blocked. It is advised to resolve this problem before attempting the upgrade. It is not supported to upgrade a WSS 3.0 or MOSS 2007 content database using the database attach method which was using a root wildcard inclusion managed path, although this is not explicitly blocked by the product.
The recommended methods to restructure site collections created with a root wildcard inclusion managed path are the following:
Note: If using the site collection backup and restore method to refactor the "My Sites" in a farm, like any "My Site" rename event, additional work may be required to fix-up the user profile and Active Directory entries for the "My Site" along with any offline links to the "My Site".
Microsoft Office SharePoint Server 2007, Microsoft Office SharePoint Server 2007 for Internet Sites, Microsoft Office SharePoint Server 2007 for Search (Enterprise Edition), Microsoft Office SharePoint Server 2007 for Search (Standard Edition), Microsoft SharePoint Foundation 2010, Microsoft Windows SharePoint Services 3.0, Microsoft SharePoint 2010 For Internet Sites Enterprise, Microsoft SharePoint 2010 For Internet Sites Standard, Microsoft SharePoint Server 2010, Microsoft SharePoint Server 2010 Service Pack 1