Netscape Progress Patch

[Michael T. Babcock]

Are there any downsides to using the Netscape Messenger progress patch?
In other words, does it violate the standards in such a way as to
potentially break any other clients?

Reminder of what patch does:
replaces "okay();" in qmail-pop3d.c with
  puts("+OK ");
  put(strnum,fmt_ulong(strnum,m[i].size));
  puts(" octets\r\n");

Thanks!