LoL, the way it works is that every [clean] reinstall generates a new device at WCG [no merging, still]. That will be a lot of [annoying] mails generated by WCG. Got 59 to my name, but including dual boot [oh dear, another source for such a mail], really there's only 4. Frankly, if I choose not to run devices due to heat or because the 'budgeted' crunching watts have been exceeded, I really seriously would -Not- want to receive any reminder. [The cited ''last return'' info on the device stats is good if wanting the take the pulse on remote devices, so WCG is tooled for those interested to see a list, expandable by playing the filter options]

WCG sends a one-time 'where have you gone' when not returning anything for 3-4 weeks, which works for some percent as win-backs.

BTW, the BOINCStats mail is generated I think after 1 year [the date of that mail seems to confirm that].