I have a client using Outlook 2003 on an Exchange server. Everything has been working fine for years until a month ago. Now she isn't receiving emails from some people but it seems to be sporadic. Sometimes email come through, sometimes they do not. Upon troubleshooting I realized today that I can send her a new message and she does not receive it. But, if I go to my sent folder and forward the message to her she gets it immediately. I experimented with several email addresses that I have and all experienced the same behavior. New messages never get to her - forwarded and replied to messages are received.
She does still receive new messages from some people, I saw them in her inbox today. And a few were from today.
Does this sound familiar to anyone?