Mac Mail and Exchange 2010

Hello, I have a Macbook running OSX Lion and want to connect Mail to a new Exchange 2010 server we have set up. Everything works great apart from this macbook, which no matter what i try returns:

MFEWSErrorDomain 56

whenever I try to connect, I have searched around for quite a while and not found anything that helped - do any of you have any ideas?
Many thanks,
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MIT was having this problem and posted this fix:

They say the error "MFEWSErrorDomain 56" could mean that the Mail app is using an old or incorrect setting for the mail server path" and they have suggestions for a fix.

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There is also a long discussion of the problem on the Apple discussion forums here:

Several of the people who were getting this error message were using OpenDNS which seemed to be blocking their exchange server. They changed their DNS to Googles:

and that solved the problem.
unrealone1Author Commented:
Couldnt solve the issue in the end, but many thanks for your assistance
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