'According to https://support.office.com/en-us/article/Locating-the-Outlook-data-files-0996ece3-57c6-49bc-977b-0d1892e2aacc'

def getPathToOSTFiles(self):

    paths = []
    DEFAULT_LOCATIONS_OST = ['<drive>:\\Users\\<username>\\AppData\\Local\\Microsoft\\Outlook', '<drive>:\\Documents    and    Settings\\<username>\\Local    Settings\\Application    Data\\Microsoft\\Outlook']
    systemDrive = os.getenv('SystemDrive')
    login = os.getenv('username')
    for aLocationOST in DEFAULT_LOCATIONS_OST:
        completeLocationOST = aLocationOST.replace('<drive>', systemDrive[:(-1)]).replace('<username>', login)
        regex = os.path.join(completeLocationOST, '*.ost')
        logging.debug('Searching    OST    file    in    {0}'.format(regex))
        files = glob.glob(regex)
        for aFile in files:
            ostFileFound = os.path.join(completeLocationOST, aFile)
            logging.info('OST    file    found    in    {0}'.format(ostFileFound))
            paths.append([os.path.basename(aFile), ostFileFound])
    return paths
