I am trying to identify something that was once a new thing. I used the word "then" to imply the subject as something that is already a past. But I am not sure if this is grammatically and semantically correct. For example:
The team wanted to show the features of the then new Windows XP.
In this case, Windows XP was new. It is not new now. However, does the word "then" imply this meaning?
Also, should it be "then new", or "then-new"?