Unable to download mail to Mac 10.9 using Mail

Unable to download mail to Mac 10.9 using Mail

Hello

The emails in and out of Zoho are working without a problem online.  
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However, I am using Mail on my Mac and they just will not download.  I am consistently getting the message 'Take (the account name) online.

It is an IMAP account.  If I go into the mail account in settings I get  the message as shown in the attached image
Thanks
Paul