Splitting PDF files with pdfsam

I had some trouble saving MS Word form letters to individual files, since Word lacks this functionality and macros didn’t quite do what I needed.

After some more searching I found pdfsam, which is — in its Basic version — free and open source software.

Now after I create a form letter in Word, I save the merged file as a PDF. Afterwards I just run it through pdfsam to split the file into new ones every n pages.