The reality is, as usual, more complex than that. In December 2006, the U.S. government changed the Federal Rules...
of Evidence for electronic data, and these rules were picked up by most of the states as well. The most relevant of these changes was that not only do electronic files themselves fall under the scope of discovery, but also any and all meta data, which includes logs.
This means the company must ensure log data is properly maintained under a written document-retention policy and that it's clear which relevant files may correlate with the logs. This is important because during a civil litigation procedure, the organization must know which logs to produce for the lawyers and which logs not to destroy as part of the usual document destruction process.
This is just a long and fancy way to say you should talk to your organization's lawyers and make a decision about how long to retain logs on the basis of their advice.
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