This is small inconvenience that now requires IE users to download a file to a specified location and then open from the file explorer. In 4.2 and prior the dialog would have the Open button which allowed the user to open the attachment.
I will provide two screenshots which demonstrate the before and after behaviour.
From a support request to atlassian I recieved the following reason:
After some investigation, it seems that the reason why this has happened is that there was a change to our HTTP headers with the 4.3 release, to add "X-Download-Options: noopen", which seems to have been part of a security patch.
MSIE seems to obey these directives more strictly than other browsers, so you are not seeing "Open" anymore. If you want to open an Office file for viewing directly, I recommend clicking the "View" link at the right of the screen, which uses the Confluence Office Connector to open the file in read-only mode.
I've added a new Knowledge base article on how to possibly get around this problem.
Please note that you have to implement this solution as your own risk!
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