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Message: [QUOTE="Brian Tillman [MVP - Outlook], post: 4686188"] OWA and Outlook are not the same thing, so it's no surprise that they will behave differently. OWA is an HTML interface directly into your Exchange mailbox. Outlook does a lot more. Any attachment opened on your PC must first reside on your hard drive. Thus, when you open the attachment, Outlook first writes it to the "Outlook Secure Temp folder" which, by default, is a subfolder of Temporary Internet Files. Windows then launches the application associated with the file type of the file. OWA does EXACTLY the same thing. In order to open an attachment, the file must be written to disk first, then the application associated with the file's type started. OWA also writes the attachment to Tempoary Internet Files, usually in the folder Content.IE, which you usually can't see with Windows Explorer. I know this because I just checked. [/QUOTE]