I have a site that is getting this email periodically on a user. The user is not reporting any issues. The message is:

Error that occurred: C05D-Dependent store file does not exist on the disk
Type of message: Messaging update
Message passed to server by: userid
To requeue, save the last attachment to <post office path>\WPCSOUT\OFS\0

Most of the tids I have read on this error talks about dropping the database by gwcheck and letting it recreate the user db. This would require archiving all of their mail beforeahand, so before I went through all that trouble, wanted to see if anyone had a better solution.