I have over 500 contacts that need to be updated to reflect the new Account Manager and their email address. Is there a way to mass update this instead of having to do it manually?
If it's the same new values across a batch, why not use a one-time SC with Change Data Value?
A list import if you need to mix-and-match new values.
An API import if you need to dedupe on something other than email.
Retrieving data ...