Miscellaneous topics that do not fit into specific categories.
If all your files are in the older .doc file format, there is no native process available in Word to convert multiple files to the newer file format.
If you have a lot of files that need to be converted, put them all into one folder, then you can use the VBA script on this thread to convert all the files to .docx.
Please note, you must change the folder location in the script to the exact path of the folder that contains all your old Word files.