OAB cannot be rebuilt if the .flt file is larger than two GB in Exchange Server 2013

Symptoms

Assume that an offline address book (OAB) was first generated in a Microsoft Exchange Server 2013 environment. When the existing .flt file is larger than two gigabytes (GB), the OAB cannot be rebuilt.

Cause

This issue occurs because the OAB file size has reached two GB as an intdata type when it should be a uint data type.

Resolution

To resolve this issue, installĀ Cumulative Update 7 for Exchange Server 2013.

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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