Event ID - 240

Event Id240
DescriptionThe following error was encountered when attempting to generate or validate e-mail addresses for username. The binding handle is invalid.
Event InformationAfter you upgrade a workstation that has the Microsoft Exchange Server 5.5 Administrator program on it to Microsoft Exchange 2000 (and the Exchange System Manager), the Import/Export functionality of the Exchange Server 5.5 Administrator program is broken. 

This Administrator program-to-Exchange System Manager-only upgrade to Exchange 2000 is necessary to support administration of both Exchange Server 5.5 and Exchange 2000 computers from the same workstation. 

When you try to import or to export by using the Exchange Server 5.5 Administrator program after such an upgrade, one or both of the following event IDs(240, 269) may be logged in the application log.
This problem occurs because the Dapi.dll file is updated by the Exchange 2000 upgrade process. This file should not be upgraded on a system that still has the Exchange Server 5.5 Administrator program loaded on it. 
There are two steps to workaround this behavior. 
Close all instances of the Exchange Server 5.5 Administrator program.
Replace the %SystemRoot%\System32\Dapi.dll file (version 6.0.4417.00) and C:\Program Files\Microsoft Integration\Microsoft Exchange 2000\Dapi.dll file with the Dapi.dll file from the Exchange Server 5.5 Service Pack 4 CD-ROM.
Reference LinksDAPI Upgrade Breaks Exchange Server 5.5 Administrator Program Import/Export

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