Method 'Categories" failed with object 'DocumentItem'

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From: Lorenz H?lscher (internet_at_software-dozent.de)
Date: 02/09/04 

Date: 9 Feb 2004 07:48:24 -0800

Hi everyone,

with Word-VBA I made an addin that lists Outlook/Exchange-eMails resp.
their attachments (which I need to import if they are newer than local
files). This works for 2 years on about 1000 customer pc's. But
sometimes there is a strange error message saying something like
"Error -2147417851: Method 'Categories" failed with object
'DocumentItem'".

What does this mean and why does it approach?

Thanks in advance,
Lorenz