[Evolution] Error : Incomplete or Invalid Multibyte

[Ow Mun Heng <Ow Mun Heng wdc com>]

Guys,
        
        I see a lot of these errors coming out from emails from my company. The
emails are stored in one specific folder.

(evolution:23679): camel-WARNING **: Could not find key entry for word
'940000000': Invalid or incomplete multibyte or wide character


This doesn't happen with other folders.

I've also changed from Mbox format to maildir format.

I noticed a lot of overheads each time I delete messages. (One folder
has like 40,000 emails from Mail-lists)