For example,I think I’d like to group my list by “member type”(while tracking other things) I need to be able to update an individual’s member type (using an import doc from excel) without editing/erasing/resetting tracked data each time.

If someone “upgrades” their membership, and I re-import a new list using auto-update, will I lose their tracked data?

Or, if I just want to update one “field” do I have to import all fields again?

Each to I have try to upload the new details the DOB does not change?????

Please can you help

To answer your question: If someone opted-out of your list on MailChimp, then you tried to import them (into that same list) via the API, we would *not* allow them back in. We would “remember” their opt-out request.

This was one of the reasons we did this in the first place. When there was no auto-update feature, MailChimp users would often create *new* lists for every campaign they create.

These new lists did not “share” opt-out records from other lists (and rightfully so), so they’d sometimes result in abuse complaints from people who already unsubscribed.

The MC engineers watch the blog closely (because I’m frequently wrong about stuff) so I’m sure they’ll jump in to correct me here.