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:
Hi team, I’m Avinoam, a product manager on Confluence Cloud, and today I’m really excited to let the Community know that all customers can now try out the new editing experience and see some of the ...
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