Not able to send attachments - Virus error

This solution article provides information to users who are unable to send attachments in Windows Live Hotmail and are receiving a virus error. Large email attachments may cause the mail download to 'hang' or cause the message to get 'stuck' in the Outbox and result in an undeliverable message. A virus such as Happy99 may also prohibit you from sending email attachments

Symptoms:
Users might get an error stating that the file cannot be attached as it appears to be unsafe.

What does the error mean?
Hotmail helps protect your computer from virus attacks by scanning the attachments for virus in your incoming and outgoing e-mail messages.

When you try to attach a file to a Hotmail e-mail message, Hotmail automatically scans the file for viruses. If a virus is found, you cannot attach the infected file until the virus is removed.

What should you do?
If you are attaching a virus-free file and receiving a false virus notification, please check for the following:

1. Type of file (example: exe, pdf, doc etc). Please make sure that you are not trying to attach a file that is blocked by Hotmail.

2. Size of the attachment. Please note that if you have a Free account – you are only allowed to attach a file of size 10 MB per email message and if you have a paid account, then the limit is 20 MB.