splitting a large newsgroup or mailinglist folder

I have a few mailinglists and newsgroups that are large and slow to 
open.  For reasons of my own, I don't want to expire old messages, but 
I'd like to hive off older ones to a separate "group" in MPro.

Can anybody provide a "recipe" for doing this, please?  Suppose I want 
to end up with messages from 2013 and 2014 in the current folder and 
messages from 2012 and before in an archive folder.

On the surface, I'd have thought it more efficient to rename the 
existing group and then make a new group with the active name and move 
recent messages to the new group.  (Since there are fewer new messages 
than old messages.)

However, it seems you can't rename a mailinglist or newsgroup folder.

So I went to "Choices > Mailinglists", selected the one in question, 
clicked Edit, made a screenshot of what is filled in, then clicked 
Delete.  Rather disconcerting warning pops up: "Please confirm that 
you want to delete the selected mailingists".  I reckoned (from 
knowing how mailinglists are configured to begin with) that the 
message really meant dropping the "mailinglist" status and returning 
that its to its original status as an ordinary mail folder.  So I went 
ahead and clicked Delete.

Yes.  The "mailinglist" became an ordinary folder again, and I could 
rename it.  Then make a new folder, give it the original name, and set 
it to be a mailinglist using the data in my screenshot.

Funny problem, though, with one of the mailinglists.  In the previous 
paragraph, it did not become an ordinary folder, but it is now showing 
as a *newsgroup*.  I'm puzzled by this, because it never was a 
newsgroup, even before I set up the mailinglist that it had been until 
today.
   How can I make this ersatz "newsgroup" become the regular folder it 
should be?  (I want to rename it, and a newsgroup cannot be renamed.)


-- 
Jim Nagel                        www.archivemag.co.uk

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