| Siebel CRM Desktop for Microsoft Outlook Administration Guide > Administering Siebel CRM Desktop > Administering Metadata > Overview of Administering Metadata
 You use metadata administration to create and manage a customization package. A customization package is associated with a set of metadata files that Siebel CRM Desktop treats as a Siebel file attachment. You can perform the following work in metadata administration: 
Upload a metadata file to the Siebel Server.
Create, update, or delete a customization package.
Display customization packages that are available, including information about a customization package, such as information about child metadata files.
Create, update, or delete a metadata file.
Display metadata files and the details about each metadata file.
Associate a metadata file with a customization package.
Download the necessary metadata files through Web services for the user.
Track the expiration of a customization package and files.
Control privileges for the user.
Control access that the user possesses to a customization package.
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