B_MAIL_ATTR_THREAD
node.ReadAttrString(B_MAIL_ATTR_THREAD, &searchText);
B_MAIL_ATTR_THREAD,
attributes.AddString(B_MAIL_ATTR_THREAD, name);
{ "THREAD", B_MAIL_ATTR_THREAD, B_STRING_TYPE },
attributed->WriteAttrString(B_MAIL_ATTR_THREAD, &attr);
addAttribute(info, B_MAIL_ATTR_THREAD, "Thread");
B_MAIL_ATTR_SUBJECT, B_MAIL_ATTR_TO, B_MAIL_ATTR_THREAD,
{ "THREAD", B_MAIL_ATTR_THREAD, B_STRING_TYPE },