>CM6 -> CM7 you have to wipe, but most OTA updaters will tell you that the OTAs from Eclair->Froyo or Froyo->Gingerbread effectively require a data wipe anyway.

>CM6 -> CM7 you have to wipe, but most OTA updaters will tell you that the OTAs from Eclair->Froyo or Froyo->Gingerbread effectively require a data wipe anyway. My mother had issue after issue after the Eclair->Froyo OTA and they went away when she did a factory reset (wipes /data). I just checked and 7.1 doesn't require a wipe, I was under the impression that it did. Is it that only when the upstream major android version changes that you need to wipe? A quick googling leads me to believe at least Google's official OTAs for the Nexus line don't require wiping.