error accesing imap mailbox outlook 2010

I have an exchange 2007 with service pack3 and i have some problems accesing an imap mailbox.

I´ve got a mailbox IMAP enabled, when I configure this mailbox in an outlook 2007 client it works with no problem, i configure the mailbox info,password and all the details I check "my SMTP server requires autentication" but when I configure this same mailbox in an outlook 2010 client, and i check in server options "my SMTP server requires autentication" it don´t work because can´t recognize user password autentication, it don´t shows any error message, he only ask all the time password (the same password that works OK in outlook 2007). If i don`t check  "my SMTP server requires autentication" i have no error, but when i send a message it don´t reach its destination.

   
Camel0tAsked:
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viveksahuConnect With a Mentor Commented:
Improved IMAP support

IMAP accounts are easier to set up in Outlook 2010 than in earlier versions. When users add a new account in Outlook 2010, the automatic configuration of a Webmail account sets the account type to IMAP for IMAP-supported Webmail accounts such as Google Gmail. This is by default. Note that users can change the account type to POP3 by selecting the Manually configure server settings option in the Add New Account dialog box.

The Delete and Send operations for IMAP accounts are also improved in Outlook 2010. IMAP accounts now have a separate Deleted Items folder. Also, Outlook 2010 does not prompt for a Sent Items folder, as Office Outlook 2007 did. This is consistent with Outlook behavior for other e-mail account types.

Outlook is more responsive for IMAP users in Outlook 2010 and Office Outlook 2007 SP2. On-demand downloads of messages now occur in the background.
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