Oh yeah, like we're supposed to guess which of the millions of e-mail
service providers that you happen to use. Nope. So the response is as
detailed as was your question: go ask whomever it is that you are trying
to use their e-mail service. They'll know.
Also, Microsoft Mail nowadays is most likely interpreted as meaning
Windows Mail included in the Windows Vista platforms. If you want help
with Windows Mail, ask in a group that discusses that e-mail client.
This group discusses Outlook.