Is it true that campaign history effects the QS of Campaing?? As I have deleted many adgroups and campaigns...that will effect my Adwords A/c???? Thanks in Advance
I don't think you can remove your history just by deleting old keywords/adgroups/campaigns. I seem to recall that Google's explanation of why you can still see these things after deleting them is that this enables them to use this data to assess your performance (or something like that)...
You are right custardMite but I have heard that if we deleted many campaign or adgroups this effect your campaign efficiency or something like that
Your account history does play a role (minor in comparison to other factors) in important QS related metrics.
^^^^ I agree as well. The account history does play a role in determining the ongoing QS score of your campaign. So, ensure from very beginning that you don't try much from the beginning itself. Leave a few things while you march forward.