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Outlook 2010 - Blocked attachments

Microsoft Outlook blocks potentially unsafe attachment files (including .bat, .exe, .vbs, and .js files) that can contain viruses.

If Outlook blocks any attachment files in a message, a list of the blocked file types appears in the InfoBar (near the top of an open email message, appointment, contact, or task).

The example below is an example of message a Live@UCL user would see if an attachment was blocked from another Live@UCL user.

Attach block warning - exchange

If a blocked attachment is sent from a non Live@UCL user, the following example shows what a user might see:

Attach block warning

 Files that are blocked

The following file types are blocked by the virus scanning system.

.app Executable Application
.asx Windows Media Audio / Video
.bas Microsoft Visual Basic class module
.bat Batch file
.cmd DOS CP/M Command File, Command File for Windows NT
.com Command
.cpl Control Panel Extension
.exe Executable File
.isp Internet Service Provider Settings (Microsoft)
.js JavaScript file
.jse Jscript Encoded Script file
.pif Windows Program Information File (Microsoft)
.scf Windows Explorer Command
.scr Windows Screen saver
.shs Shell Scrap Object File
.vb VBScript file or Any VisualBasic Source
.vbe VBScript Encoded script file
.vbs VBScript file
.ws Windows Script File
.wsc Windows Script Component
.wsf Windows Script file
.wsh Windows Script Host Settings file

Possible workarounds

For a non live@ucl sender

Any .zip files or other archives containing any of the above file types will also be blocked:
If you need to send a file of one of these types, there are several possible workarounds.

1. Rename the file extension to something else

For example you could rename 'file.exe' to 'file.ex_'. The recipient will have to rename the file back to the original extension. To rename a file in Windows, simply right-click on it and click 'Rename'.

However, by default Windows hides file extensions, so 'file.exe' may appear simply as 'file'. In order to rename the file extension you must first make sure it is displayed. to do this, click Start, My Computer, then click Tools, Folder Options. Click the View tab and untick Hide extensions for known file types.

2. If the content is available on the internet consider providing a link to the content for the person to download.

3. Place the content inside a .zip archive which is encrypted and provide the recipient with the password to open the .zip archive.

For a live@ucl sender

If you are sending to another live@ucl user,using a compression utility, such as WinZip, creates a compressed archive file that has a different file name extension.

Outlook does not recognize these file name extensions as potential threats and will not block the new attachment.

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Page last modified on 06 apr 11 14:14