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We're running Release 6.0.10_GA_2692.UBUNTU10_64 UBUNTU10_64 FOSS edition and seeing attachment corruption after an IMAP copy from the Inbox to a folder. So far it's mostly been PDFs but, apparently, it also happens with xls files. Not all of them, either.
Has this happened to anyone else? I'm reindexing the mailbox right now, but I don't think that it's going to help.
Bugzilla
Wiki
Source
Attachment corruption on imap copy 
Linear Mode
