If I add the the '&utm_source=MSN' parameter to my URLs in AdCenter, will this reset my history for the KW/campaign(s)?

[AnthonyYoung]

I need Google Analytics to correctly parse PPC campaign key words from Bing.

[Bevelwise]

I think if I understand your question correctly that you are asking whether adding the query string param's utm_source will it affect the stats in your campaign.  No your keyword stats in MSN Adcenter's campaign will stay not be lost because you are only changing a destination url in your ad copy.  If you're asking will G Analytics pick up the change and change historic data the answer would be no.

Also another tidbit - use &utm_term={keyword} as well because that's Adcenter's parameter to pass in the dynamic keyword being clicked as well.

[AnthonyYoung]

In Google Adwords if the destination URL is changed then it resets the history for that keyword and the campaign. Was Wondering if simply adding the utm_ parameter in Adcenter would have the same result...