Google Groups has a feature that disables replying to posts older than 30 days:

http://groups.google.com/support/bin/answer.py?answer=1676&topic=250

Can I reply to older posts in the archive?

You can reply to any message in Google Groups that was posted in the
last 30 days. After 30 days, the option to post a reply to the message
is removed. In Usenet proper, articles are usually retired (removed
completely) if they are inactive for 30 days. Removing the option to
post a reply to a message more than 30 days old simulates this feature
in Google Groups.


Bill
--
Google Domain Mail:
http://groups.google.com/group/GoogleDomainMail

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