Outlook 2003 not receiving new messages

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?
Who is Participating?
Are the messages there in OWA? DOes OWA work correctly.
Disable any outlook rules.
If that does not do it I would create an new outlook profile.
martyphillipsAuthor Commented:
They have an old Exchange Server that was running out of hard drive space.  Cleared off some temp files and everything works much better.
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