There have been lots of posts about setting up regular Yahoo email on the Droid but I haven't seen too many for Yahoo Business Email. My company uses Yahoo for hosting and email solutions. (They're pretty good). I had a hard time getting my mail to work but after going through this forum (and some iPhone forums which were actually more helpful than I thought they'd be), I got it to work with folder access as well.
Go to manual setup > IMAP account and use these settings:
Email Address: Your email
Username: Your email
Password: Your password
INCOMING
Imap server - imap.mail.yahoo.com
Port: 143
Security type: none
OUTGOING
Check login required
SMTP Server- smtp.bizmail.yahoo.com
Port: 25
Security type: none
You don't get push but its worked for me consistently and you do get to access folders. (Still doesn't work over wifi)
Go to manual setup > IMAP account and use these settings:
Email Address: Your email
Username: Your email
Password: Your password
INCOMING
Imap server - imap.mail.yahoo.com
Port: 143
Security type: none
OUTGOING
Check login required
SMTP Server- smtp.bizmail.yahoo.com
Port: 25
Security type: none
You don't get push but its worked for me consistently and you do get to access folders. (Still doesn't work over wifi)