Apple mail in mountain lion cannot download many attachment (corrupt)

I have the same problem on all my macs, and also my friends. That includes:
- MacBook Pro 17"
- MacBook Pro 13"
- MacBook 13"
The problem is that almost every email attachment is corrupt. It means it can in most cases not be opened, except for photos and then they just show some grey area where it's not loaded.
- that all attachment can perfectly be opened on all my iOS devices. 2x iPhone 4, 1x iPad1, 1x iPad2, ipad4, 2x iPhone5
- the problem accures with many files types, but PDF, excel, png, jpg, doc, igs are some I have tried.
I think the problem comes from slow or irregular internet speed. Obviously that should not be an issue and isnt with any other mail program.
This problem is so bad that I'm thinking of switching the mail app as its basically useless. I tried thunderbird and all attachments were loading properly. But it had other issues.
I found a solution that works around this to at least work. Its still not solving it, but at LEAST i can get the mails attachments and work with them, rather than having to forward the mail from my iphone.
http://www.macobserver.com/tmo/answers/how_to_fix_corrupted_imap_attachments_in_ apple_mail/
Basically 2 solutions: I prefer option 2, as it can be done fast and each time the issue happens.
1) click the mailbox that has the issues
go to Mailbox in the status and click "Rebuild"
This will re-download all mails. its a bit overkill, but it works.
I've tried this and it also does not download the mails correct. In the end it just shuffles which mails are loaded this time.
2) create a new mailbox inside the main IMAP mailbox account
move or copy the message with the broken attachment there
now do option 1) only for this mailbox
then move the repaired message back.
Same this still not guarantee the attachment.
Such a stupid issue!!!!!

Dear All,
its driving me mental!!! Its now almost every mail attachment that does not load correct! there must be something that can be done.
I also am not the only one.
Please help.
Martin

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http://macperformanceguide.com/Mac-HowToClone.html
http://www.macupdate.com/app/mac/7032/carbon-copy-cloner
http://www.macperformanceguide.com/blog/2012/20120711_2-MacPro-internal-clone-ba ckup.html
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Apple mail in mountain lion cannot download many attachment (corrupt)

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