I've been tasked with importing a Do Not Contact List of roughly 47k into our Contact database. Most imported just fine, around 45k, but some didn't import because the contact already existed in our system. I was wondering if their was a way for me to edit all of these existing contacts in one go, instead of having to manually alter each and every one individually. I've only been on the job a couple of months with no prior experience, so any and all help is appreciated on solving this issue
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