Calendar sharing between Exhcnage 2010 and Outlook 2003

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NYExchg2010

Exchange 2003/Exchange 2010 SP1

Outlook 3003 SP3

I have a user who is accessing a bunch of shared calendars. Calendars that were shared prior to the migration to Exchange 2010 do not have an issue.(I have enabled encrypted communication on the Outlook 2003 client.) However, calendars created on any new mailboxes on Exchange 2010 are not visible, the message is 'Information Store is not available'.

Any inputs will be appreciated.
 
N

NYExchg2010

I have already enabled MAPI encryption, I am getting the error on,

Outlook 2003 trying to access a shared calendar on a new Exchange 2010 mailbox

I do not get the error when,

Outlook 2003 accesses a shared calendar on a mailbox that was migrated from Exchange 2003 to Exchange 2010

Thanks for the pointer.
 
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