Outlook Web Access in Safari

Hello

We are running a dual booting mac enviroment at our school and when staff use the MAC OS they use outlook web access to access there email. Now when the staff try to send a attachment they get the following error “Outlook Web Access was not able to process this request” now if the staff reload it works but it happens alot and is a pain.

I was just wondering if anyone has come across this particular issue.

Thanks

Scott