Reply By Email extension for Projectfork 3.0.x. Reply By Email is a Joomla 1.7, 2.5 plugin that will enable users to reply to comments and discussions directly from their inbox! No longer will you need to log into Projectfork to reply to a posted comment! The Reply By Email extension requires that your hosting account is configured with php-imap and iconv . To ensure that you meet the criteria we have prepared a simple script which you can download from here , unzip and upload to your hosting account's root folder. Once uploaded navigate to http://your-domain/checkcompat.php . If you receive a success message you are right to go! I believe that you should probably be offering a different file for Outlook 2003 and Outlook 2007. Alternatively I believe that offering updating calendars only for Outlook 2007/2010 would be acceptable, I've noticed that other sites do this. Downloading the Calendar does work, but for project management based stuff I'd say it's useful if the calendar does an automatic update.