1. the latest Service Pack 3
2. Microsoft ActiveSync
3. Microsoft .NET Framework 3.5 and Microsoft .NET Framework 3.5 Service Pack 1
anyway DigiTerra Explorer 7 will not run on your computer.
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You will see the following error message if ActiveSync has not yet installed on your computer:

It is also recommended to use DigiTerra Webupdater service to keep your DigiTerra Explorer 7 up to date. DigiTerra Explorer ca automatically check for updates at startup by enabling this feature on the Settings > System tab.
