Sandboxing - what exactly does it do to your websites

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I've been search for a more detailed answer to this question without luck. Around 3 months ago, I set up a website and did all the SEO malarky. One of the inner pages for it's keyword went to Number 1 in Google fairly quicklyThen without warning, it (the whole site) just dropped out of Google completely. I assumed this meant it was sandboxed.The last PR update gave the inner page a PR2 and it has been making an appearance around 140-ish in Google for the same keyword. It's number 1 in MSN.So, is the website sandboxed or not?I guess my question is "If a site is sandboxed, is it dropped from the search results completely or just penalised so it appears much further down?"I'm trying to work out if I need to try to optimise the site better or if it'll just be release in due courseThanks in advanceI'm having the same problem, I'm 3rd in msn for my keyword, but not even listed yet in google for that same word, even tho it has catched my site, so it can be found, recently I went to 4th in yahoo, now i've dropped out of that one too, vanished!, my sites been active for 7 months now too?.The answer is it appears much further down.It especially affects compteitive keywords, and usually lasts for about 1 year.Yep, I had the same problem but mine is much worse... My page showed up in google