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Event ID: 27 Source: Outlook

OAB ModDif failed.
As per Microsoft: "This problem occurs during the offline address book generation process. If an address that is entered in the offline address book contains an SMTP proxy address that is longer than 64 characters, the Outlook client does not apply the .diff file. The Outlook client then downloads the whole offline address book". See ME909565 for a hotfix applicable to Microsoft Exchange Server 2003.

See ME843483 for additional information about this event.
See ME871132 to resolve this problem.
Installing Office 2003 SP1 has resolved this problem for me.

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