Hi Ichase,
Yes, to answer both of your first questions. You can use Move Archive (MA) to move from archives that are stored on Centera to archives that will be stored on HCP; and from archives stored on Centera to archives stored on ECS.
Those are not archive types, rather your storage platform that you keep your archives on. As long as the data is retrievable in the source, and the destination is writable, the MA subtask really doesn't care what you're stored on. It uses an API to retrieve and copy the data, and our storage service in either device type handles the rest.
As far as the "other" types that MA can't support - you're right, generally non-standard-mail type archives.
We CAN use MA to move Exchange mailbox, Exchange Journal (vault store to vault store within a single site), or Domino mailbox and Domino Journals (vault store to vault store wihtin a single site) archives as well.
We CAN NOT use MA to move the types you had listed; those are all accurate. The only "others" I can think of are Inernet Mail (IMAP) and SMTP. While they're still "mail," they're not the traditional mailbox-style archives the industry has used for so many years. Hope this helps!