There are several options for support depending on your need:

Microsoft products
If you need help with installing, uninstalling or using any Microsoft product, please contact Microsoft support at http://support.microsoft.com/. If you need help re-downloading Microsoft products you purchased on Window Marketplace, please contact digital locker support for Windows and Office here: https://support.msn.com/default.aspx?productKey=marketplacephone&ct=eformts

Help with digital locker
To get help with digital locker, use your Windows Live ID to sign into digital locker at https://digitallocker.windowsmarketplace.com/locker.aspx, scroll to the bottom of the page and click the "Help" link.

The digital locker service will remain operational through August of 2009: During this time we will send emails and web communications to help customers transition from digital locker. By the end of August 2009, digital locker service will be shut down. Digital locker account holders should retrieve and record elsewhere their software keys from digital locker before this shutdown occurs.

Can I continue to use digital locker?
Yes. Digital locker remains open through August of 2009. You'll be able retrieve product keys and re-download any software you have stored.

Can I transfer my digital locker to Microsoft Store?
No. Microsoft Store uses its own account system and does not use digital locker.

How can I back up my products from digital locker?
As long as digital locker remains open, you can burn the programs in your digital locker to CDs or DVDs. You must have first completed the download of the software.
To backup your software, use the digital locker assistant.

XP: If you are using Windows XP, you must have the digital locker assistant installed on your computer. You may have already done this if you used it to download software from Windows Marketplace. If you do not have the digital locker Assistant installed click here. Once the digital locker assistant is installed, it can be accessed from either a desktop link or the Start menu.

Vista: If you are using Windows Vista, the digital locker assistant is already installed on your computer. You can access the digital locker Assistant through the Control Panel.

1. Click Start
2. Click Control Panel
3. Click Programs
4. Click Programs and Features
5. Click View purchase software (digital locker)

Once in the digital locker Assistant

1. Insert a blank CD-R or CD-RW into your CD drive
2. Login to the digital locker Assistant
3. Select the product you want to backup
4. At the bottom of the page, click on View License
5. Copy or write down your license information
6. Click Okay
7. In the gray area near the top of the page, click Create Back-up CD. (This option will only appear if the software has been downloaded)
8. When prompted to burn the CD, click Next
9. Click Finish

How do I get to digital locker?
Click here: https://digitallocker.windowsmarketplace.com/locker.aspx. To sign in, you will need to have the Windows Live ID you used to create the account.

How can I get help with my digital locker?
Go to digital locker at https://digitallocker.windowsmarketplace.com/locker.aspx, use your Windows Live ID to sign in, scroll to the bottom of the page and click the "Help" link.

How do I find more information on digital locker?
See the digital locker FAQ

For purchases made on Windows Marketplace:
Each seller listed on Windows Marketplace has its own return and refund policy. Please contact the product manufacture or seller of your purchase. If you purchased an item through the digital locker, sign in to your digital locker account here https://digitallocker.windowsmarketplace.com/locker.aspx and click Purchase History. Contact information for each seller from whom you've purchased products is located under "Additional Details".

For purchases from Microsoft Store:
For more information on Microsoft Store returns policies, please click here http://store.microsoft.com/Help/Returns-Refunds.

Don't remember if you bought an item through Windows Marketplace or Microsoft Store?
Contact the digital locker Support Team https://digitallocker.windowsmarketplace.com/help.aspx for assistance in determining where your purchase was made. You will need to have your Transaction ID available, which can be found on your purchase receipt or credit card statement.

There are many options for partners to showcase their products across the Microsoft network (go to http://www.microsoft.com/windows/compatibility/partner to find more information).