Notes about the VFB file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries, unused processes and other unfavourable system settings to identify slowdown issues.
The VFB file type is primarily associated with 'Outlook' by Microsoft Corporation.
Internet Free/Busy (IFB) is a feature of Microsoft Outlook that allows you to see when others are free or busy so that you can efficiently schedule meetings.