Based on my research, we do not need to save it as postscript.
The following steps is for "How to print to EPS from Microsoft Office":
Start button -> type in window "add printer". In "add printer" dialog, go to: "add a local printer", in "choose a printer port", do "use an existing port" and select 'print to file'.
In "install the printer driver", select any PS printer.
For printer name, chose e.g. "XXX .eps Printer Driver".
Do not share this printer.
When the wizard finishes and it is installed, type "print" (ctrl-P) from an Office program.
I selected "xxx.eps Printer Driver", and just below that selector there is "printer properties" link.
Select that, choose "advanced tab", expand "PostScript Options", and for "PostScript Output Option", select "Encapsulated PostScript (EPS)" from the drop-down menu.
Then you can print with this driver to create .eps files.
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