Yes, it is. Could you check if UIDPLUS appears in the capabilities with
'offlineimap --info'?
Not for this server:
Remote repository 'h.knizek-remote': type 'IMAP'
Host: imap.seznam.cz Port: None SSL: True
Establishing connection to imap.seznam.cz:993 (h.knizek-remote)
Server welcome string: * OK Seznam IMAP server ready
Server capabilities: ('XLIST', 'IMAP4REV1', 'AUTH=PLAIN', 'CHILDREN', 'SORT',
'I18NLEVEL=1')
Jan Knížek
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