Seems admin-moderator are not much Strict or lazy for moderation...
Think spammers are welcome on this forum....lol

siteadmin wrote:Link exchange still work with top search engines. i agree with your post

Don't just go for link exchange try to get them naturally and with relevant theme of that of your site.

Switching to new server won't affect your ranking but changing your domain name will surely affect, you will have to re-optimize your site from the scratch.
So don't change your domain name.

Me too
How can we check for bad neighbors. please help ....

IMO once you found and fixed the misdeed then you should file an reinclusion request at Google.
You can read more at : blog.webhosting.uk.com/2006/11/25/googles-minus-30-penalty

also what do you mean by “ removed backlinks from Google ” I don’t understand what do you mean.