[Tickets #7744] Monthly maintainence issue, possible NFS related?

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Ticket URL: http://bugs.horde.org/ticket/7744
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  Ticket             | 7744
  Created By         | Eric Rostetter <eric.rostetter at physics.utexas.edu>
  Summary            | Monthly maintainence issue, possible NFS related?
  Queue              | Horde Base
  Version            | 3.3
  Type               | Bug
  State              | Unconfirmed
  Priority           | 1. Low
  Milestone          |
  Patch              |
  Owners             |
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Eric Rostetter <eric.rostetter at physics.utexas.edu> (2008-12-01 10:40) wrote:

When the monthly tasks run and process the IMP tasks, it is  
consistently failing to create the new sent-mail folder on my system.   
The results are:

     * Message sent-mail folder being renamed at the start of the month.
     * Success The folder "sent-mail" was successfully renamed to  
"sent-mail-nov-2008".
     * Warning The folder "sent-mail" already exists
     * Message Old sent-mail folders being purged.
     * Success The folder "sent-mail-nov-2007" was successfully deleted.

As you can see, everything works except the creation of the new  
sent-mail folder (folder already exists).
This is using dovecot as the imap server, using NFS for the  
filesystem, in case that matters.  This used
to work, but broke some time ago though I've never got around to  
reporting to now.  It _may_ be related
to dovecot, nfs, or the combination, but I really don't know...

I see nothing in the horde log file, the imap log file, or in a quick  
look at the web server logs.

If anyone has any ideas on how to debug this, I'll do whatever is requested...