This is getting ridiculous. This same issue exists in the newer version of Confluence. Fix it or effectively tell your customers (They pay for the product remember) to sod off.
Confluence needs to support opening a link in a new window.
Although I admit that it probably shouldn't use target as that's deprecated, it should still do it (article on standards compliant way: http://www.sitepoint.com/article/standards-compliant-world).
Wordpress does it and I use it all the time. Within a week of us rolling out Confluence at my company, people have started asking for it.
I am aware of the
CONF-1210, CONF-7045, and CONF-6947 marked "Will not fix," but this is a simple feature found in competing products which users find useful and I wanted to open it again and get votes behind it.
macro doesn't do this for external links so it doesn't satisfy this requirement.