No, it makes no difference.
When you say MS Outlook, do you mean that is the client you are using on your computer, or your email address is name@outlook.com?
In any case, this sort of thing can happen in a number of ways;
Someone else in your circle of friends had exposed their address book. The spam then randomly uses one contact in that address book as the spoof From: address and sends email to everybody else in that address book.
You have exposed your address book and the above happens.
Somebody sent an email with a large number of people in the To: or CC: and that email header has been used.
A specific computer can be compromised and then the address book used.
There are more, and often they are used in combination. etc. etc.
However, the chances are that the emails are NOT from you, they just say that they are. Its very easy to do.
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