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My site has been online since March 2003, and on june i got more than 40 external links,My site PR4 on Google
(my e i linked to site with PR0). Now i lost that
subdomain.mydomain.com still normal
Google treats subdomains as separate sites. Whatever is wrong with your main site probably isn't on your subdomain.
3- have you linked to any sites recently that have a zero PRI don't think thats a valid concern these days. Linking to an obviously bad neighbourhood can still be a bad thing, you just can't identify bad neighbourhoods with the toolbar anymore.