If the image inserted into a page / blog through attaching from pc,
it couldn't show in outlook 2007, even when I logged in confluence with IE 8.

I founded the images source URL has been changed in outlook 2007.
For example, the image source link was:
http://192.168.1.116/download/attachments/1245186/cat.jpg?version=1&modificationDate=1344266671018
But outlook, it was different:
http://192.168.1.116/download/attachments/1245186/cat.jpg?version=1&modificationDate=1344266671018
Outlook added "amp;" after "&" of the image link.
I doubt if this is the reason why outlook cannot show images.

Is there any solution for outlook to show the attached images?
BTW, is it possible to show images without login Confluence?