Google today announced that over next couple of days, the company will be making "User Managed Storage" available to Google Apps customers as well, allowing the purchase of extra storage for Google Docs, Picasa Web Albums, and photos from Blogger. Any of these products that is over its storage quota can use the extra storage on a first-come, first-served basis.
UMS is a service that has allowed users to purchase more storage space when they fill the allotted quota on their personal Google Accounts. Users that upload lots of files to Google Docs, sync their Office documents to the cloud using Google Cloud Connect for Microsoft Office, or store and share pictures using Picasa or Blogger can now expand the storage space available for these files.
Pricing for this service is the same as for personal Google Accounts::
UMS can be enabled by your domain admin from Apps Control Panel at https://www.google.com/a/[your_domain.com] (replace [your_domain.com] with your actual domain name), and the end user purchases additional storage using his or her Google Checkout account.
Note that the Checkout service must also be enabled to allow end users to purchase additional storage.
Additional storage added using UMS cann't be pooled or transferred to another Apps user account and cann't be used for Gmail. Data stored using UMS is subject to the same ownership policy as other data in the Apps account.