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diff --git a/src/mailman/model/usermanager.py b/src/mailman/model/usermanager.py
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+++ b/src/mailman/model/usermanager.py
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+# Copyright (C) 2007-2009 by the Free Software Foundation, Inc.
+#
+# This file is part of GNU Mailman.
+#
+# GNU Mailman is free software: you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or (at your option)
+# any later version.
+#
+# GNU Mailman is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with
+# GNU Mailman.  If not, see <http://www.gnu.org/licenses/>.
+
+"""A user manager."""
+
+from __future__ import absolute_import, unicode_literals
+
+__metaclass__ = type
+__all__ = [
+    'UserManager',
+    ]
+
+
+from zope.interface import implements
+
+from mailman.config import config
+from mailman.interfaces.address import ExistingAddressError
+from mailman.interfaces.usermanager import IUserManager
+from mailman.model.address import Address
+from mailman.model.preferences import Preferences
+from mailman.model.user import User
+
+
+
+class UserManager:
+    implements(IUserManager)
+
+    def create_user(self, address=None, real_name=None):
+        user = User()
+        user.real_name = ('' if real_name is None else real_name)
+        if address:
+            addrobj = Address(address, user.real_name)
+            addrobj.preferences = Preferences()
+            user.link(addrobj)
+        user.preferences = Preferences()
+        config.db.store.add(user)
+        return user
+
+    def delete_user(self, user):
+        config.db.store.remove(user)
+
+    @property
+    def users(self):
+        for user in config.db.store.find(User):
+            yield user
+
+    def get_user(self, address):
+        addresses = config.db.store.find(Address, address=address.lower())
+        if addresses.count() == 0:
+            return None
+        elif addresses.count() == 1:
+            return addresses[0].user
+        else:
+            raise AssertionError('Unexpected query count')
+
+    def create_address(self, address, real_name=None):
+        addresses = config.db.store.find(Address, address=address.lower())
+        if addresses.count() == 1:
+            found = addresses[0]
+            raise ExistingAddressError(found.original_address)
+        assert addresses.count() == 0, 'Unexpected results'
+        if real_name is None:
+            real_name = ''
+        # It's okay not to lower case the 'address' argument because the
+        # constructor will do the right thing.
+        address = Address(address, real_name)
+        address.preferences = Preferences()
+        config.db.store.add(address)
+        return address
+
+    def delete_address(self, address):
+        # If there's a user controlling this address, it has to first be
+        # unlinked before the address can be deleted.
+        if address.user:
+            address.user.unlink(address)
+        config.db.store.remove(address)
+
+    def get_address(self, address):
+        addresses = config.db.store.find(Address, address=address.lower())
+        if addresses.count() == 0:
+            return None
+        elif addresses.count() == 1:
+            return addresses[0]
+        else:
+            raise AssertionError('Unexpected query count')
+
+    @property
+    def addresses(self):
+        for address in config.db.store.find(Address):
+            yield address