I've never seen a "newwinlink" macro as part of a Confluence install, so I'd suggest that where you've used it before, it was provided by an add-on or one of the admins had created a user macro for it.
There's a handful of addons providing this sort of thing in the marketplace, but a simple user macro should do it easily as well.
you could use something like that:
## Macro title: Button mit Link (in neuem Fenster/Tab) ## ## Developed by: Mario Günter ## Date created: 2015-11-09 ## Installed by: Mario Günter ## Button with Target Blank ## @param Name:title=Name|type=string|required=true|desc=Title of Button ## @param Link:title=Link|type=string|required=true|desc=Address, e. g. http://google.de?q=Hello World <a href="$paramLink" target="_blank">$paramName</a>
You can "install" this Makro directly to your Confluence at the following administration:
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