Event ID - 27

Event Id27
SourceOutlook
DescriptionOAB ModDif failed. (Details record in event data).
Event InformationAccording To Microsoft:
RESOLUTION

Hotfix information
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Microsoft Exchange Server 2003 service pack that contains this hotfix.

Note: In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.
Reference LinksWhen you run Outlook 2003 in Cached Exchange Mode, all the Outlook clients in the Exchange Server 2003 organization try to download the offline address book at the same time

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