Issue
I get the error message "Unable to open key: 0", when trying to match users using the GAL.
Solution
Notes Migrator is trying to open the registry key HKCU\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles to get the list of MAPI profiles.
Confirm the Registry has a list of MAPI profiles.
If the registry contains a list of profiles, make sure you have the permissions to read/access the registry.
If you're in high security environment or they have a policy on your user account, it's likely permissions are affecting this.
If the list is empty, then go to Control Panel - Mail - "Show Profiles"
Remove the profiles, and recreate them - make sure you disable "cache mode"
Retry the matching process.
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