Script Download: ChangeDefaultPaperSize(PowerShell).zip
http://gallery.technet.microsoft.com/scriptcenter/Change-Default-Paper-Size-fcd07271

This script demo shows how to Change the default paper size in Word such as Letter to A4, A4 to A5.

Many users asked this question about how to change the default paper size (Letter) to others (A1, A2...B1, B2...) automatically.

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You can find more All-In-One Script Framework script samples at http://aka.ms/onescriptingallery