How to export multiple MXDs to PNG without using VBA?

Question

Okay, so I can feel that I am so close to solving this issue with the help of Jason (below) but I have modified to use as a script. The GetParameterAsText returns the following error when trying to execute:

: [Error 3] The system cannot find the path specified: u"'C:\Users\bob\Documents\folder\file.mxd';'C:\Users\folder\Documents\Folder\file.mxd';'C:\Users\folder\Documents\folder\file.mxd'\*.*"

Anyone know what is wrong with my code to keep getting this error?

    import arcpy, os, string

    #Read input/output folder path from script tool
    folderPath = arcpy.GetParameterAsText(0)
    outPNGfolder = arcpy.GetParameterAsText(1)

    for filename in os.listdir(folderPath):
        fullpath = os.path.join(folderPath, filename)
        if os.path.isfile(fullpath):
            basename, extension = os.path.splitext(fullpath)
            if extension.lower() == ".mxd":
                mxd = arcpy.mapping.MapDocument(fullpath)
                arcpy.mapping.ExportToPNG(mxd, basename + '.png')

Answer 1

From Jeff Moulds (ESRI) originally for pdf export here's some python you can customize. It works on all mxds in a folder so you could adjust that or perhaps copy the projects into one temporarily for exporting. I added paragraph spaces after the first 3 lines to make the text properly indent in the box below, not being smart enough to do that any other way.

import arcpy, os
folderPath = r"C:\Project"
for filename in os.listdir(folderPath):
    fullpath = os.path.join(folderPath, filename)
    if os.path.isfile(fullpath):
        basename, extension = os.path.splitext(fullpath)
        if extension.lower() == ".mxd":
            mxd = arcpy.mapping.MapDocument(fullpath)
            arcpy.mapping.ExportToPNG(mxd, basename + '.png')