Antigen 9.0 for Exchange with Service Pack 1 cannot detect MP3 files when a file filter of *.* or *. is created and the file type that is selected is MPEG (MP3)

When a file filter of *.* or *. is created, and the file type selected is MPEG (MP3), Microsoft Antigen 9.0 for Exchange with Service Pack 1 cannot detect files as such and then filter it accordingly. The e-mail messages and attachments will successfully reach the intended recipient.

To resolve this problem, install Hotfix Rollup 5 for Antigen 9.0 with Service Pack 1.

For more information, click the following article number to view the article in the Microsoft Knowledge Base: Note You must install Antigen 9.0 for Exchange with Service Pack 1 before you install Hotfix Rollup 5 for Antigen 9.0 with Service Pack 1.

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.