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Recently I noticed a huge drop in our clients Google Impressions via GWMT from 900 impressions to 70 overnight on October 30, 2012 and has remained this way for the entire month of November 2012. The SSL Cert had expired in mid October due to the notification message for renewal going to the SPAM folder and being missed. Is it possible for an SSL expiry to be related to this massive drop in daily impressions which in-turn has also effected traffic? I also can't see any evidence of duplicate pages (ie. https and http) being indexed but to be honest I'm not the one doing the SEO therefore haven't been tracking this. Thanks for your help! Chris