Specify on which port and with which protocol the IMAP access to the mailserver (specified in the basic setting) must be connected.
For Microsoft Exchange 2007 or newer, the IMAP-access via IMAPS can be used. With Microsoft Exchange 2003 and IBM Domino, IMAPS is not supported!
You can use the Connection test to check access (including login) to a mailbox.
Specify the registration data and start the test.
When using Micrsoft Exchange, please note:
The "Administrator" used to install the Exchange Server does not have IMAP4 access!