Unable to send from Blackberry Handsets on enterprise server

We run a Blackberry Enterprise Server with 10 Blackberry's, two of our blackberry's are acting very strangley and won't send email.

When we send a message we get a reply "Message Status: Desktop Email program unable to submit message"

I have checked out the Rim Knowledge base and it says it could relate to cacheing of credentials between exchange and BES, and to down the BES to allow force a cache refresh.  I have tried this with no success.

Does anyone have any suggestions, it only happens with 2 of our blackberry's the rest work like a dream.
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Kurt_BraeckmansConnect With a Mentor Commented:
Are your send as rights ok for those users?
Are these users domain admins?

also reread this post:
We had a case like this and solved it with this:
To solve this you will need to regenerate the encryption key.
Goto Settings/Options then open “Security Options”.
Now select General Settings and scroll to the last line: Desktop [number] (3DES) and click on the wheel.
Select Regenerate Encryption Key.
When this is done, try sending a mail.
itigroupAuthor Commented:
Nope, unfortunatly that didn't fix it.
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itigroupAuthor Commented:
Nope none of the suggestions on admin rights or in the suggested posting have helped does anyone else have any suggestions?
Maybe the Desktop service books are corrupted?  Try to push service books by using the Blackberry server manager.   You can delete Desktop[CMIME] first just to make sure it replaces the old one with a working one.
itigroupAuthor Commented:
I retried this and it worked.  This is better that Telstra Blackberry support, they couldn't solve this one.

Thanks Guys You rock.....
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