Internal email going to Junk E-mail folder

I have an Exchange 2003 server and have multiple users telling me that they are receving in-house email going to their Junk E-mail folder in Exchange 2007. Is there any way to guarantee that all email coming from my domain, to my domain, makes it in everyone's Inbox?
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Do you have Exchange 2007 installed on Windows 2008 R8 by any coincident, they are not compatible and give you this sort of behavior. Install Exchange 2010 on Windows 2008 R2 of Reinstall windows with a non 2008 R2 version.

Greg27Author Commented:
I do have a 2nd server running Windows 2008 Server and Exchange 2007 on it. It installed a connector between itself and the Exchange 2003 Server. I only have a few test accounts on the Exchange 2007 server. I don't have any user accounts on it. All of my production email accounts are on my Exchange 2003 server. So, you are saying that if I uninstall that server and go to Exchange 2010 on a Windows 2008 R2 server, I shouldn't see this problem again?
If the server second server is running Exchange 2007 on Windows 2008 R2 it's not compatible. Check your windows version, it It 2008 R2? If it is 2008 R2 and you want to keep a R2 release go for Exchange 2010.
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Greg27Author Commented:
My current version of Exchange Server 2007 is running on a Windows 2008 Server, not an R2 box. The Exchange 2007 Server has a connection setup between itself and the Exchange 2003 Server whiich is on a Windows 2003 Server, not an R2 box. Will uninstalling Exchange 2007 take care of my problem?
If you run normal windows 2008 it's somethng else. Do you have IMF setup on one of the boxen thats servers as a smtp host?

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Greg27Author Commented:
I have IMF setup on the Exchange 2003 Server. How do I check to see if it is setup on the 2007 server?
This will probably help to check

Greg27Author Commented:
Looks like it is not installed on the Exchange 2007 Server, just on the Exchange 2003 Server.
Greg27Author Commented:
Sorry PenquinN... I just realized that my question included in-house email going to the Junk E-Mail folders in Exchange 2007. I meant to say Outlook 2007. I have opened up a new question with the correct content and I will award points for the effort. Sorry to have wasted your time.
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