Open up the registry using regedit.
Word 2013 on premise recent files are under HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Word\File MRU
Recent files are located as Items in the File MRU key while recent places are locate as Items in the Place MRU key. (Pinned items were marked as such as part of the key with the string "[F00000001]" instead of "[F00000000]".
exported the relevant keys from HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Word\File MRU:
Import the registry items to the O365 location:HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Word\User MRU\OrgId_7C1003B06BB8E5C66E405E15389AD205F98BDC72318690F76D4FC2D36038D8D7\File MRU
- Edited by MAHER0 13 hours 41 minutes ago