splitting a large news file

For reasons of my own I like to keep the contents of c.s.a.announce 
(for instance) going back some years on my own harddrive rather than 
relying on online archives.

Opening such a big mailbox in Messenger Pro (7.06-4) has become 
unwieldy.

I'd like to split off all the threads older than, say, six months into 
a separate newsbox so that I have only a small one to open for current 
stuff.

Seems sensible that simplest surgery would be to:
 * rename present newsbox as c.s.a.announceD (past tense, geddit?),     
 * set up a new one called c.s.a.announce,
 * move the newest threads from D to the new announcebox.
In other words, move the smaller number of threads.

Problem:  how to rename the existing (say) c.s.a.apps?  Click menu 
over any newsgroup in Messenger's window, Rename is greyed out.

-- 
Jim Nagel                        www.archivemag.co.uk

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