This setting is not available if you selected "Store ixi-UMS messages only locally".
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!