Briefly, yes. You will need an interface program. OE is an email client, whereas Yahoo and hotmail are web-based... when you are looking at your mail in those two all you are doing is looking at just another webpage, albeit one you need a password for. For Yahoo interfacing, try YPops.
er, bobby.... I use YPOPS! to run my free Yahoo email ac from OE... :)
It quietly downloads mail from yahoo whenever I open OE, deletes read mail as I delete it from OE, and sends my mail out through Yahoo.
I believe there is another interface pgm out there for hotmail.. but I don't use hotmail, so...
for hotmail ,simply open outlook ex,and go to tools and accounts and add account and when asked for email address type in you hot mail address then you passwork when asked and then import folders from hotmail ,and it will go from there and set it up for you .that simple