Migrating Contact Data from One User to Another

Hi Folks,

We are currently using ACT 2012 and I am having an issue migrating one user's data to another user. Now, we set up a custom field (Account Rep) that our users use to designate which contacts are theirs. We had a user leave and we would like to take their contacts and migrate them to a new user. In essence, we need all of the previous user's contacts to reflect the new user's name in the Account rep field. I feel like I have done this before, but I cannot find my documentation.

I have given the new user access to the old user's contacts, but I am unsure how to assign the new user's Account Rep ID to the contacts. Any help would be appreciated.

Thanks!