Re: reading email via imap, make one virtual group consisting of all UNREAD mails in the imap folders

[Andrew Cohen]

By default the query you tried just searches for the word "unseen" in
messages in the group. Instead try using a prefix arg

C-u G G

then type "UNSEEN" in response to the "Query" prompt

and type "imap" from the "Imap search in" prompt.

If this works then you can create a persistent search.