Exchange 2007

In a private to private relationship, get this error if you set the per user read and unread on the pivot folder

To fix, remove the per read and unread from Exchange Management Console, Toolbox Public folders and find the pivot and remove the checkbox

Log Name: Application
Source: EXCDO
Date: 4/30/2010 8:43:03 AM
Event ID: 8208
Task Category: General
Level: Error
Keywords: Classic
User: N/A
Computer: ROSUDOSERVER.rosudo.local
Description:
Calendaring agent failed with error code 0x8000ffff while expanding recurring appointments.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="EXCDO" />
<EventID Qualifiers="49155">8208</EventID>
<Level>2</Level>
<Task>3</Task>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2010-04-30T15:43:03.000Z" />
<EventRecordID>178321</EventRecordID>
<Channel>Application</Channel>
<Computer>ROSUDOSERVER.rosudo.local</Computer>
<Security />
</System>
<EventData>
<Data>0x8000ffff</Data>
<Binary>48725175657279526F77733A3A536574496D706C6965645265737472696374696F6E73206661696C65642E204D61696C626F783A4C6F756973652043686172626F6E6E656175</Binary>
</EventData>
</Event>