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OWA - Blocked attachments

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

If OWA 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