I don't know the answer to the question of which one get listed in HIERARCH.PM but do know that there is a utility created specifically to address this issue.  It is called PMRestArch and was created for the purpose of preventing internal ID conflicts when restoring archived folders.  It does the following:

1. Copies all .PMM and .PMI files in the source directory to the destination directory and renames them as BAKxxxxx.PMM and BAKxxxx.PMI.
2. Ensures that the resulting file is Read/Write.
3. Creates a different internal unique ID for the file.

Find it at: http://www.lexacorp.com.pg/lexacorp_utilities.html#EMail

As for manually editing the ID, I have never heard of anyone doing it so would love to hear the results if you choose to give it a try.

Hi all,

accidentally, I got one PMM+PMI files pair copied within the filesystem where my mail is located. As Pegasus does not care about the filenames but about the ID stored in the PMM, what happens when Pegasus finds that when launching? I.e. I have FOL00ABC.PMM + FOL00ABC - Copy.PMM both containing the same numeric sequence at the start (and corresponding .PMI twice as well). Looking in HIERARCH.PM, there is of course only one record for that object ID.

I presume Pegasus shows only one of them to the user, but which one? The one it spots first while scanning the mail filesystem directory for mail folders (so the order depends on what the filesystem gives first which is beyond Pegasus control and should such pairs remain there for longer time, they might be accidentally switched resulting in a loss of some mails stored in the "formerly first one" since the copy happened)?

(I just wonder, it is not much a problem for me and probably a manual change of the ID in the copy would help to solve it as then Pegasus will add it as a newly discovered folder)

David