Two updated Mac OS X mail packages, Post.Office 3.6 and WEBmail 6, are now available from Tenon. Post.Office, the mail server and list server, was recently extended with a plug-in architecture that simplifies the incorporating of open source tools such as SpamAssassin (a spam detector). Now a new plug-in for virus scanning has been added. WEBmail, a Web-based mail client, has added an integrated Web calendar that lets you share your calendar in a group environment to coordinate meetings.