Save them to your harddisk first instead of opening directly from Outlook.
Opening the item (mail) first and then the attachment works as well but then
you are editing in a temp folder which is not recommended.
--
Robert Sparnaaij [MVP-Outlook]
www.howto-outlook.com
Tips of the month:
-FREE tool; QuickMail. Create new Outlook items anywhere from within Windows
-Properly back-up and restore your Outlook data