How to change one readed exchange mail to unread

uipath

#1

how to change one readed exchange mail to unread
i have one readed exchange mail,now need change mail state to unread,how to do? tks
in UIPATH,mail read state can use mail.Headers(4).tostring get,
if mail.Headers(4).tostring=“true” is readed,
how to change to “false”?