My client was trying to create a 'Reply All' to an email in history, the
email having many recipients in it. So my client just clicked Reply to All
and typed her message and sent it, but had this error:

Duplicate Record:
A record with these values already exists. A duplicate record cannot be
created. Select one or more unique values and try again.

FYI, when forwarding there is no error.

Environment:
SBS 2003

Email is working perfectly fine for other CRM tasks. They can attach files
and everything. Only in this instance they are having error.