NM: Receive the following error in Outlook: "Outlook blocked access to the following potentially (4311926)

Issue

After migration I noticed the attached files in the emails are not visible in the Exchange which are migrated from Notes. When tried using Outlook or through OWA I am receiving the error; "Outlook blocked access to following potentially unsafe attachments; Transporter.msi"

How can I prevent this?

Solution

This is not a migration issue.  When you receive an e-mail in Microsoft Outlook that contains an attachment, you might receive the following message at the top of the message or of the Reading Pane:

"Outlook blocked access to the following potentially unsafe attachments:"

All versions of Outlook since Outlook 2000 Service Release 1 (SR1) include a security feature that blocks attachments that might put your computer at risk for viruses or other threats. Although Outlook blocks access to the attachment, the attachment still exists in the e-mail message. 

This article describes methods that you can use if you have to open an attachment that is blocked in Outlook. Additionally, this article contains information about the kinds of attachments that Outlook blocks.

http://support.microsoft.com/kb/829982

http://attachmentsecurity.com/