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Launch VirtualBox
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Select Virtual Media Manager from the File menu
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When Virtual Media Manager window opens, select the VM file you want to migrate and click on Copy button
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When the Copy Virtual Hard Disk window opens, click on ExpertMode button to enable selecting required options on one screen.
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Under Hard disk file type, select VHD (Virtual Hard Disk)
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Wait for the copy process to complete
Convert vhd to vhdx
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Launch Hyper-V Manager
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Under Actions, select Edit Disk…
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Click Next on the ‘Before You Begin’ screen
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Browse for the copied file. The file will be having a file extension of vhd. Select the file and click Next button.
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On the Choose Action window, select Convert and click Next button
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Select VHDX format and click Next
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Select Dynamically expanding and click Next
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Select a name and location for the file and click Next
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Click Finish and wait for the conversion process to complete