i was at a friends house today that has a imac. he also has a yahoo email adress working with imap settings with the built in mac mail program. I forgot to check his settings but I am 100% sure i saw imap. I just did a quick search and didnt find anything so it may be new but i did find this on a outlook 2010 thread. I have not tested this but found this on
http://social.technet.microsoft.com/Forums/en-US/outlook/thread/0111c5c2-9350-464a-8950-cc0cd23a039eIncoming:
imap.mail.yahoo.com
SSL: True
Port: 993
Outgoing
smtp.mail.yahoo.com
SSL: False
Port: 587
Outgoing server requires authentication: Checked
Use same settings as incoming server
and another way
incoming server:
smtp-ssl.mail.yahoo.com
port 143
outgoing server:
smtp.mail.yahoo.co.uk
port 465
More settings:
Click on the Outgoing Server tab
a. Check My outgoing server (SMTP) requires authentication
b. Make sure the Use same settings as my incoming mail server radio button is selected.
Click on the Advanced tab. Under “Server Port Numbers”, enter the following:
a. Incoming server (IMAP): 143
b. Use the following type of encrypted connection (under Outgoing Server): Select SSL
c. Outgoing server (SMTP): 465