Hi Vipul,
There is NO “ResetEVClient” kind of utility for MAC add-ins, however you may try to kill EV process (EV helper & toolbar) from activity monitor then will generate with new PID automatically. Worth to mention, you cannot retrieve archived email just double clicking on it, you need to use ‘view’ option available with EV MAC toolbar.
Even if you unable to retrieve the emails then my suggestion would be collect EV console trace available with MAC client HOWTO38265 then analyze “/download.asp” request.
Regards
Pradeep Papnai