Replied in m.p.outlook.general - if you need to post to multiple groups,
it's best to do so all at once in a single message (separate the NG names
with commas) so that everyone can follow the thread. Thanks.

Crossposting = posting once to several newsgroups within a single message.
This is not a Bad Thing (presuming the list of groups posted to is small,
and all the groups are truly relevant to your question)

Multiposting = posting separate, identical posts to several newsgroups. This
is a Bad Thing. :-)

See http://www.blakjak.demon.co.uk/mul_crss.htm