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Initially it was believed the company got tired of keeping the activation servers running to support legitimate installs of ~8 year-old software and decided to give it away. But that's only partly true.
Turns out Adobe did retire the activation servers used by CS2 back in December, but when legitimate owners of the suite started complaining that without these servers they'd be unable to reinstall their copies if needed, the company began offering versions of CS2 that didn't need activation.
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Adobe later clarified that in order to legally use CS2 users still require a purchased license, and that the move was just meant to assist its existing customers. Yet the download page and serials are still live.
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Adobe has disabled the activation server for CS2 products, including Acrobat 7, because of a technical issue. These products were released more than seven years ago, do not run on many modern operating systems, and are no longer supported.
Adobe strongly advises against running unsupported and outdated software. The serial numbers provided as a part of the download may only be used by customers who legitimately purchased CS2 or Acrobat 7 and need to maintain their current use of these products.