Little time-saver script, because Microsoft's Outlook.com UI is not able to cancel/rollback a "Delete all" action (no operation possible on Trash's Select all)

imap_trash2inbox.py

# https://imapclient.readthedocs.io/en/2.1.0/
# https://imapclient.readthedocs.io/en/2.1.0/api.html#module-imapclient.testable_imapclient

# py -m pip install imapclient
import imapclient
server = imapclient.IMAPClient('outlook.office365.com')
server.login('user', 'pass)
server.select_folder('Deleted')
messages = server.search()
total_move = len(messages)
moved = 0
per_call = 100
while len(messages) > 0:
    to_move = min(per_call, len(messages))
    moving = messages[0:to_move]
    try:
        server.move(moving, 'Inbox')
        del messages[0:to_move]
        moved += to_move
        print('Done {}/{} ({}%)'.format(moved, total_move, int(moved/total_move*100)))
    except Exception as e:
        print('Failed {}/{} ({}%) : {}'.format(moved, total_move, int(moved/total_move*100), e))