Out of Office on OWA; Exchange 2010

We recently migrated from Exchange 2003 to Exchange 2010 and were having issues with out of office.
OOF works fine in outlook but when you try and run it from OWA we get internal server error 500.  The OOF URL was pointing to the internal machine and we changed this to the outside and I can access it. 
I saw something about rebuilding ECP but I don't know what this actually does so I haven't tried it yet.
Any help would be apperciated

Hi,
Based on the description, you couldn't turn on OOF in OWA and you got the error: internal server error 500. If I misunderstood your concern, please let me know.
OOF is based on the Exchange Web Services, if either the internal or external URL for the EWS is missing or incorrect, OOF will fail and other services may not work as expected.
Please check the URLs assigned to the web service virtual directory using the Get-WebServicesVirtualDirectory command.
If the issue persists, please post the error here for further analysis.
Best regards,
Belinda
Belinda Ma
TechNet Community Support

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