OWA 2010 emails slow to arrive

Hi guys
We have installed Exchange 2010 alongside another server running Exchange 2003 on the same domain. We are still testing the 2010 Exchange server with a few users but have noticed if they use the OWA, emails are slow to arrive  (up to an hour or so later). Also calendar reminders are slow to appear also and will generally be old by the time the pop up appears. Anything we can do to fix this? Has anyone seen this before
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Glen KnightConnect With a Mentor Commented:

Can you run the Exchange Best Practice Analyzer and see what that brings back.

Also make sure Exchange 2010 is fully upto date.
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