Hi, Jason
The process is essentially the same, just in a different location. Log in as the System Admin and from the Manage tab, clic on Manage. In the Actions (...) menu you'll see the options to Attach User, Attach Folder or Rebuild Folder. Here's the Help page that explains what each option does: https://help.smartertools.com/SmarterMail/v16/Topics/SystemAdmin/Manage/AddDomain.aspx (just click on the Restore a User link at the top of that page to get to the proper section.)
I hope that helps.
Derek Curtis
COO
SmarterTools Inc.
www.smartertools.com