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It seems to me that there would be a significant difference between the site not making the cut in an update (happened to me, followed by six weeks' sweating, followed by reinclusion) and being dropped *between* updates...
There are a whole lot of reasons that could have caused this.
There are a LOT of people who assume that their site dropping out, or losing PageRank, or even falling a few positions in the SERPS means that Google has "penalised" them.
To my mind they are wrong in the vast majority of cases.
One reason, for example, might be that your server was down or not responding when the deepcrawl Googlebot came to call in early February. Check your logs - were you crawled by the deepcrawl bot? Do the logs show any other kind of problem? Did it manage to pick up your home page successfully. Look for anything unusual...
This seems to me to be the most likely cause.
OK, so how do you maximise your chances of a speedy return?
1) Clean up your site. Follow the Google guidelines and get rid of anything they say they don't like.
2) Follow as best you can the great advice on this forum about building a good, SE-friendly site.
3) If you have multiple domains pointing at your site, pick the one that you want to run with and put the others on a 301 redirect to it, again much advice on this forum as to how.
4) Sort out your hosting if it needs sorting.
5) Having done all this, submit a reinclusion request to search-quality@google.com.
6) Don't let up while you wait for the next update. Keep cleaning the site and getting good links back to your site.
My main site dropped out in the January update and apart from sweating and panicking, I also followed steps 1-6 as best I could. The site returned in the last update with better rank and more backlinks than before, and my referrals have doubled.
Best of luck
Henry
I'm going to spend some time cleaning up and improving my site.
Then prehaps I'll reappear in google....eventually.
The only thing that worries me is have inadvertently done something google doesn't like? In which case I assume I'm unlikely to get re-listed.
Time will tell.
Thank you for all the advice
Steve