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Event ID: 7 Source: MSExchangeWebServices

After 5 unsuccessful attempts to send a notification for subscription FABwaGxtYWlsMi5lbWEtaW5jLmNvbRAAAABpzBY1RWfxT7Lcyz6gxfH/ subscription has been removed.
I have a lot of errors on Exchange 2007 application log. I think this relates to the Public Folders database that is not available for the organization. This exchange server configured to use Public Folders on the other exchange server which the PF database has been dismounted for a while before it being retired.

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