Syncing Offline Contacts With Email List

This is a fairly common use case that we get requests for: the need to update your email list without losing sent history, custom variables, etc. Well we listened, and implemented a simple sync tool for email lists (will be available in a few days).
Now when you upload a CSV file into an existing list (using the Data Sync tool) two things will happen:
1) If the email address is new, a new entry is appended to the list.
2) If an email address already exists, all the custom variables will be updated with the entry.

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