The Mac and Linux GW 8 HP2 client throws a D124 error for any user with calendar errors created prior to an account name change. (In the recent past all user names were changed to a consistent format)
If all calendar entries for the user are removed the errors disappear.

However, this error does not appear on the GW 8 Windows client OR on GW 7 client for the Mac.

GW 8 HP2 server on Netware
GW 8 HP2 client on Mac/Linux

Any ideas?