It probably comes down to a question of economics and bandwidth. You can't keep just adding content and bandwidth infinitely, so something has to give at the front end like a rolling delete to keep within bandwidth.
There's probably no way (other than manually) to assess what is just forum banter (and deleteable) vs. good technical content threads.
Fortunately a lot of the technical content gets captured at other websites, but to be sure I save anything I think that is truly noteworthy to Word files. That goes for content from both here and the DT e-mail list.
Julian
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