What membership do I need to convert PDF files to Microsoft Word ("docx")
You would need Export PDF membership to convert pdf files to MS word format, Please refer the following link for more information : Export PDF to Word or Excel online | Adobe Export PDF
Users with Reader can subscribe to the Export to Word service.
Acrobat users do not need this service, as it is built-in to Acrobat.
Newer versions of Word can open and edit PDF files.