Attachments are all converted to .ashx suffix vs. original file types like .docx or .xslx...
Firefox 8.0.x does not like our OWA (attachment.ashx)
UGA OIT says, there is a problem with attachments being viewed by the outlook web email system and Firefox 8. See below. Here are the three workarounds: 1) Right-clicking and renaming the attachment with the proper name and extension. 2) Revert to Firefox 7. 3) Use another browser.
Tutte le risposte (1)
Outlook Web Access sends an illegal Content-Dispositon header to Firefox. This is no longer allowed in Firefox 8. Firefox 9 will have a workaround for this so that Microsoft has time to fix their software.
See http://support.mozilla.com/nl/questions/895024
https://support.mozilla.com/en-US/search?q=attachement.ashx
Bug 704989 - add workaround for broken Outlook Web App (OWA) attachment handling
You can help us by sending a complaint to Microsoft and tell them that their software is broken.