Unified Mail Accounts on Webmail IMAP

Unified Mail Accounts on Webmail IMAP

Hi,

I need to add several emails to my webmail so I can see them all in my account. The thing it only lets me add POP accounts and when it syncs, it marks all mails as unread even thought they have bben read on Outlook or my phone. This only happens with the ones I cant mark as IMAP.  In the control panel they are marked as IMAP....help?

Thanks

Igal