A received message with a blocked attachment.
Does the message in the picture look familiar? It’s a message about a blocked attachment.
Outlook now automatically blocks certain types of attachments. This blocking helps protect your computer from viruses and cannot be changed. Although this enforced blocking makes file sharing less convenient, you should be aware that you can still use e-mail to share any file type with trusted friends and colleagues — you'll just need to take a few extra steps for the sake of enhanced security.
For more information about ways to send and receive attached files, see About unblocking attachments.