This is a strange one, so I feel I need to ask some more questions.

Can the emails be accessed from a different device?


Have other kinds of attachments been sent and received by this user without issue?
The emails from the specific contacts produce the same error as the emails with Excel attachments?

Good morning HiFlyTechGuy

I hope I answer the question fully, here goes;

The email is sent from User X to a variety of users on the Domain.
Everyone gets the mail, can open the mail and can open the Excel attachment.
Everyone except my problem user, User Y.
So let's say User Z also got this email with the Excel attachment, and can view and open it. I ask User Z to send this mail to User Y, then User Y can view and open it. I cannot bend my mind around this.
User Y only gets Excel documents from User X.
The problem started when I issued User Y with a temp notebook while his actual notebook is sent away for warranty. At that point in time I did not know that a error so simple was going to evolve into such a issue.

Cheers

Gideon