Adepters is still at adepters:
1. Mailing list hosted by PTC/User
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The PTC/User portal (http://www.ptcuser.org) hosts the long-running Adepters mailing list. This list started in 1996 and has always been monitored by the PTC/Arbortext software engineering staff. Many long-time users and tools folks also regularly monitor the list. If you have a question, it's a really good resource as questions generally get answered within 24 hours. Beginning and advanced questions encouraged.
The List Email Address is: -
You can join the list from the PTC/User portal: http://portal.ptcuser.org/p/fo/si/topic=21
2. The Adepters Information Archive
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The Adepters Information archive is located here http://www.adepters.org.
Many Arbortext users regularly search it for help with difficult to solve issues. The archive was started by Karl Johan Kleist. In 2008, Karl changed career paths, and Liz Fraley at Single-Sourcing Solutions has been maintaining it ever since.