Windows e-mail issue

Just installed a new PC with W10 and am having issues using Windows e-mail.  I successfully set up an account to link with my e-mail provider and do receive incoming e-mails, but all of the other previously established folders set up with my provider are not showing up in Windows.  I've spoken with the provider and have verified that most setting protocols are correct (IMAP; non-SSL; authentication; etc), the only settings not verified are the ports.  But I can't find anything in Windows e-mail to allow for  verification or change of port settings, so based on a previous Microsoft comment, I added in the port setting, ex.  993, right after the outgoing/incoming server info; ex: mail.xxxxxxx.com:993:1.  I also saw a variation of this without the (:1) being added; neither solution worked as I still cannot get the other folders.  So, after more than a few hours of research and talking, e-mailing and chatting with others, I've reached a decision point to cancel using Windows e-mail, but I'm willing to give it one more try.  Any solutions out there?