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[edited by: Atomic at 7:05 pm (utc) on Jul 15, 2011]
...on sites that had not been touched in any way for over a year, up to 6 years in one case. They were getting steady predictable traffic and immediately following minor changes the traffic plummeted.
Quirks code eliminated for compliant code. Thumbs up.
If there have been no changes whatsoever in years (no new products?...)
Not once has there been even the slightest impact on any of my Google rankings. Not even once.