Exchagne 2003 to Exchagne 2010 Migration Issues

LAst week i have installed Exchage 2010 SP2 , with coexistance with Exchange 2003.
I have moved around 15 users from Exchagne 2003 to Exchagne 2010.

Now users facing few issue, one issue is very critical.
Outlook 2003 users who are still in Exchagne 2003 SErver not able to open users calender who are moved in to Exchagne 2010 SErvers.
I have reassign the permission , recreate the profile but status is same.
Please advice..
am230089Asked:
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DLeaverCommented:
I had the same issue post migration this week, within Outlook I just went to open shared calander and selected the required user again and it automatically reconnected it back up - have you tried this?
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am230089Author Commented:
Yes, i tryied this also but it is not opening.
it is shwoing i"Unable to display the folder. The information store could not be opened"
Error message.
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DLeaverCommented:
Its the co-existence thats causing the issue, so not the same issue as I mine as my 2003 Exchange had been removed - however it is a recognised problem

http://support.microsoft.com/kb/979690
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am230089Author Commented:
i have 90thousand mailbosex so it is not posible to remove the exchage 2003 right now,
Coexistance phase will comtinure for year
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DLeaverCommented:
Just check the link to the hotfix I have sent you, this explains why the co-existence causes issues with the calander and the hotfix should resolve the issue for you
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am230089Author Commented:
So where we have to install this hot fix , Forsnt end server or BAckend servers ?
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DLeaverCommented:
I would install it on all of your Exch 2003 boxes.

Reading the hotfix I would lean towards the backend servers where the mailboxes are stored, but I think running it on all Exch 2003 servers would be advisable
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am230089Author Commented:
Thanks for right Approch.
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