If you mean the blog at:
http://mango-tree-ponderize.1127575.n5.nabble.com/then it is up and running at this moment - with a banner showing in my browser stating:
This blog will be deleted soon!
Nabble has scheduled this blog to be deleted on Dec 30, 2016; 7:00am due to its inactivity.
Click on the button below if you want to save this blog from deletion.
[Don't delete this blog]
However most of the message is illegible because to the colours scheme used on the blog.
I'd click on the button without delay as in my part of the world it's past that time!
Volunteer Helper - but recommending that users move off the platform!
Once the admin for GregHelp now deleted.