How to get your mails back (from a public folder)

You may use this script to get a sub tree of a public folder forest back into eml format, which then can be imported into other email oriented solutions. You also may need to change the auth_type for the Configuration object and the access_type for the Account object. Both may differ in your environment.

# Public folder download (c) by Sven Ludwig
# 
# Public folder download is licensed under a
# Creative Commons Attribution-ShareAlike 4.0 Unported License.
# 
# You should have received a copy of the license along with this
# work.  If not, see <http://creativecommons.org/licenses/by-sa/4.0/>.

import sys
import getpass
import argparse

from exchangelib import Account, Folder, Credentials, Configuration, NTLM, DELEGATE
from exchangelib.protocol import BaseProtocol, NoVerifyHTTPAdapter

# Tell exchangelib to use this adapter class instead of the default
BaseProtocol.HTTP_ADAPTER_CLS = NoVerifyHTTPAdapter

parser = argparse.ArgumentParser()
parser.add_argument('--server',   help="Server to be contacted",                 default=None)
parser.add_argument('--account',  help="Account to be used (Email address)",     default=None)
parser.add_argument('--path',     help="Path to be dumped",                      default=None)
parser.add_argument('--username', help="Username to be used for authentication", default=None)
args=parser.parse_args()

if sys.stdin.isatty():
    if (sys.version_info > (3, 0)):
        def getInput(description, parser=None, password=False):
            if parser is not None:
                return parser
            if password:
                return getpass.getpass(description)
            return input(description)
    else:
        def getInput(description, parser=None, password=False):
            if parser is not None:
                return parser
            if password:
                return getpass.getpass(description)
            return raw_input(description)

else:
    def getInput(description, password=False):
        return sys.stdin.readline().rstrip()


try:
    print("Enter basic configuration")
    print("====================================================================")
    server   = getInput("Server (exchange.example.com):    ", args.server)
    account  = getInput("Account (name.surname@exam.pl):   ", args.account)
    path     = getInput("Path (a/b/c):                     ", args.path)
    username = getInput("Username:                         ", args.username)
    password = getInput("Password:                         ", password=True)
except KeyboardInterrupt:
    print()
    print("Aborted")
    sys.exit(0)

credentials = Credentials(username, password)
config = Configuration(server=server, credentials=credentials,auth_type=NTLM)
a = Account(account, config=config, autodiscover=False, access_type=DELEGATE)

a.root.refresh()
a.public_folders_root.refresh()

current_folder = a.public_folders_root

for subdir in path.split('/'):
     if subdir.strip() == '': continue
     current_folder = current_folder / subdir

paths=[current_folder]
for path in current_folder.walk():
     path.refresh()
     paths.append(path)
     print(path.absolute)
     print(path.total_count)

for path in paths:
     for item in path.all().iterator():
          with open('{0}-{1}.eml'.format(str(path.absolute).replace('/','_'), item.message_id), 'w') as f:
                f.write(item.mime_content)