Windows 7 and NAV 4 SP3

Hi All.

Having issues sending mail from NAV. Using Codeunit 397.

Client has used the Vista patches from NAV4SP3 to get NAV up and running on a Windows 7 box. I understand that it is not a supported config but want to try get it working.

Scenario 1
When running the application and trying to execute Mail.NewMessage the NAV gets to the Logon line and crashes.

IF (NOT OApplication.Logon(TRUE,'','',FALSE,FALSE)) THEN BEGIN  //<--- HERE
  OApplication.Logoff; 
  EXIT
END;

Windows Event Viewer gives the following info :-

Faulting application name: finsql.exe, version: 4.0.3.25143, time stamp: 0x46d625b9
Faulting module name: OLHandler.dll, version: 6.0.29626.0, time stamp: 0x4a84a092
Exception code: 0xc0000005
Fault offset: 0x000523fe
Faulting process id: 0x11d0
Faulting application start time: 0x01cb32b55ef9616f
Faulting application path: C:\Program Files (x86)\Microsoft Business Solutions-Navision\Client\finsql.exe
Faulting module path: C:\Program Files (x86)\Microsoft Business Solutions-Navision\Client\OLHandler.dll
Report Id: a0e71d0f-9ea8-11df-a6bb-001a4d5fa5ea

Scenario 2
When running finsql.exe under Windows XP SP3 Compatabilty an error is raised in the same place. I got the error message and error from OApplication and raised it like so :-

IF (NOT OApplication.Logon(TRUE,'','',FALSE,FALSE)) THEN BEGIN  //<--- HERE
  MyErrorMessage := OApplication.ErrorDescription + ' Code ' + FORMAT(OApplication.ErrorStatus);
  ERROR(MyErrorMessage)
  OApplication.Logoff; 
  EXIT
END;

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Microsoft Business Solutions-Navision

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An error has occurred while creating an instance of the Outlook application. Code 2434

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OK

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I have tried

Registering the OLHandler.dll from 2009SP1

Registering the OLHandler.dll from 5.0

Any ideas appreciated.