Windows Live Hotmail doesn't support all file types. If you send an attachment that Windows Live Hotmail doesn't support, the e-mail recipient won't be able to download or open the attachment. You can't unblock a blocked attachment after it's been sent. However, to send or receive an unsupported file type as an attachment, use one of the following methods, or ask the person sending you the attachment do so:

• Compress the file.

  Use a zipped folder or a third-party compression program to compress the file, and then attach it to your e-mail message as a .zip file. See your software documentation for information about how to compress a file.

• Change the file extension to .txt.

  Locate the file that you want to attach, right-click the file, and then click Rename. Type txt in place of the original file extension, and then press ENTER. Attach the renamed file to your e-mail message. Remember to tell the recipient how to change the file extension back after they download the attachment to their computer.

• Upload the file to Windows Live SkyDrive.

  SkyDrive is a free service that you can use to store and share your files online with friends or with anyone in the world. Use any computer connected to the Internet to access your files, and share your public files or folders with anyone by e-mailing them a link to the file or folder. You can upload files up to 50 MB in size, and you receive a total of 5 gigabyte (GB) of online storage space. To get started with SkyDrive Beta, go to the Windows Live SkyDrive website.