Outlook 2003 displays Unread emails

We have a user who is testing Citrix Xen with Windows 7 and Outlook 2010.  Emails in Outlook 2010 are listing as read when he reviews his emails. However, when he returns to the office and  connects with the network (using Windows XP and Outlook 2003) those emails that he reviewed are showing up as Unread.  We use Exchange 2007.  Any help would be greatly appreciated.
JennisonAsked:
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Neil RussellConnect With a Mentor Technical Development LeadCommented:
Firstly make sure that BOTH acounts are NOT set to open in CACHE/offline mode.
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khairilCommented:
Hi,

Ensure that Outlook at his office is set to using Exchange connector, avoid using POP.
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JennisonAuthor Commented:
This fixed the issue.
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