Microsoft Outlook allows you to create Contact Groups, also known as distribution lists or email groups. If you routinely send email to the same group of people, setting them up as a Contact Group allows you to save time by sending the email to the group instead of entering all the addresses. You can also create a Contact Group that contains other Contact Groups. In most cases, there is no limit to the number of email addresses you can have in a Contact Group. Writer Bio

Maximum Number of Addresses in a Microsoft Mail Group - 33