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Exchange Event ID 1020 error

Last Modified: 2015-03-12
We keep getting the following error and the server it is referencing is no longer an Exchange server and has not been for awhile. Any assistance would be appreciated:

Log Name:      Application
Source:        MSExchange Store Driver
Date:          3/10/2015 6:54:09 AM
Event ID:      1020
Task Category: MSExchangeStoreDriver
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      Titan.donald.com
The store driver couldn't deliver the public folder replication message "Folder Content Backfill

Response (APOLLO-IS@dwma.com)" because the following error occurred: Property validation failed.

Property = [{00020329-0000-0000-c000-000000000046}:'Keywords'] Categories
Error = Element 0 in the multivalue property is invalid...
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
    <Provider Name="MSExchange Store Driver" />
    <EventID Qualifiers="49156">1020</EventID>
    <TimeCreated SystemTime="2015-03-10T10:54:09.000Z" />
    <Security />
    <Data>"Folder Content Backfill Response (APOLLO-IS@donald.com)"</Data>
    <Data>Property validation failed. Property =

[{00020329-0000-0000-c000-000000000046}:'Keywords'] Categories
Error = Element 0 in the multivalue property is invalid..</Data>
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