when im sending an attachment from my PC to my Mac, the mac reads attachment as Winmail.dat, im sending from PC in in HTML format, is it my Mac that's converting to Winmail.dat or my PC?

ik typ mijn e-mailadres en wachtwoord in en er komt op dat ik er niet op kan? 
01. October 2012 · Write a comment · Categories: livemail · Tags: , ,
it is now 43 days dat y canot sending e-mails y can receiving en open mails not sending
I have to users both using Outlook for Mac  2011. An email comes in with an attachment which they are both CC'd. One of them gets the correct .pdf attachement, the other recieves a "winmail.dat" attachment. Now I know there are apps that will convert the winmail.dat, but i'm curious as to why if it is an issue with the windows user sending the email, why didn't they both have the same issue? Is there a setting that I can toggle to fix this?
01. June 2012 · Write a comment · Categories: Uncategorized · Tags: , , , ,
I cannot open attachements as they arrive as winmail.dat. No problem when the same email is sent  to my PC.