Since Hotmail.com has become Outlook.com

I thought I had no more problems sending my attachments to my work secretary.  For the first month of work in September had not problems sending my saved EXCEL to our secretary.  Now for the almost whole month of October, I can not send any type of attachment.  As soon as hit the insert button from the saved open file, the internet disconnects.  This is very frustrating.  Can anyone help? 

Thank you,

I Tron