I have been configuring a new Virtual Machine to demonstrate SharePoint and I'm using Windows Server 2008. All went well, until I tried to configure Outlook to receive email on the VM. Then I recalled that POP3 was no longer included in Windows 2008, which is a shame. So I proceeded to find an alternative. Exchange would have been a bit too much on my memory limited VM which already has SQL Server, SharePoint etc.
I came across MailEnable which is a free mail server. I installed it and it worked very nicely providing SMTP and POP. It has an easy to use admin interface and was pretty easy to setup (once I fixed some DNS issues on my VM)