Out of office settings cannot be displayed because the server is currently unavailable

We just performed an upgrade from Microsoft Exchange 2003 to Microsoft Exchange 2007 on our mailserver.  After we finalized our settings, we are noticing that some users cannot change their out of office assistant message.  They are receiving an error of "your out of office settings cannot be displayed, because the server is currently unavailable. Try again later"

We have searched the web for possible solutions but we have made these changes but the problem still exist.
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AmitIT ArchitectCommented:
Can you check MSExchangeMailboxAssistants service in the services snap in. Make sure it is set to Automatic and it is running. If stopped , start it and then test it. MSExchangeMailboxAssistants is responsible to initiate the function for Resource Booking, Out of Office, Calendaring and Managed Folder Assistants. You will find this in Mailbox role server.
Public folder and shared information will not be available ot client.

If you see further, busy/ free time wont be available as well.  Please try out the below:

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Is everyone on Exchange 2007 now? What versions of Outlook are you running? If you are running Outlook 2003 then you will need a public folder store on your E2k7 server.

Also ensure you are on at least E2k7 SP3
nreichAuthor Commented:
Sorry, this should have said 2010 Exchange, not 2007. Although I know a few of these suggestions still apply. As soon as I can free up an end-user or reproduce the issue on a test machine, I will give these a try. Thanks.
nreichAuthor Commented:
The issue ended up being a problem with a configuration within Exchange where the pointer for msstd was still pointing to a reference of our star cert when it should have been pointing to our new certificate we had to purchase for this mail server.

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nreichAuthor Commented:
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