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Thank you Chris for the reply  I had a read through  the links you sent I think I will play it safe and stick with HTML

Hi

My site is ranking quiet well for the past 10 years although it is becoming a bit dated. I am thinking of  revamping it using Modx.  Will this affect the ranking . Does a HTML site rank higher then CMS or does it no longer matter. I believe one of the reasons my site ranks so well is because it is  a very basic HTML design.  Should I just put a new HTML template on it

Thanks