Things to try...
.>>Try switching your mail to the older HTML style for better browser compatability<<
.>>Check you have not disabled active content/java or anything the mail app requires for functionality <<
The above a very likely........
.Try an up to date browser chrome/ffox/ Opera/etc
.Look through any ant-virus/browser settings for things related to mail attachments
.Get the attachment re-sent, it can help to .zip files to avoid security issues with certain file types.
.Check the attachment properties to ensure it's a valid file
.If it's a big file it may be larger than allowed as a single attachment
.If you are trying to view the file inside your browser you need the relevant plug-in installed (ie Acrobat, MSoffice)
