are you implying that you have used sb_imapfilter with other IMAP servers and not experienced message lossage
No, this is my first time trying sb_imapfilter

My expectation is that SpamBayes should never delete email
I suspect this comment in sb_imapfilter points to what might be happening:

"""Warnings:
o We never delete mail, unless you use the -e/purge option, but we do
mark a lot as deleted, and your mail client might remove that for
you. We try to only mark as deleted once the moved/altered message
is correctly saved, but things might go wrong. We strongly
recommend that you try this script out on mail that you can recover
from somewhere else, at least at first.
"""

Now if I look at gmail vs hotmail IMAP settings there are these extra options that gmail provides and hotmail doesn't:

When I mark a message in IMAP as deleted:
Auto-Expunge on - Immediately update the server. (default)
Auto-Expunge off - Wait for the client to update the server.

When a message is marked as deleted and expunged from the last visible IMAP folder:
Archive the message (default)
Move the message to the Trash
Immediately delete the message forever

I have a feeling hotmail behaves like gmail with "Auto-Expunge on" and "Immediately delete the message forever".

I'm wondering if someone with IMAP expertise can comment on the above theory or maybe propose a workaround for hotmail.

Can you attach your config file with your Hotmail credentials xxxxxx-d out
[imap]
server:outlook.office365.com
use_ssl:True
username:
filter_folders:Inbox
spam_folder:Inbox/spam.90
unsure_folder:Inbox/spam
ham_train_folders:Inbox/train.ham
spam_train_folders:Inbox/train.spam

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