If you are looking for basically an online / offline message board type of application, Lotus Notes does this exceptionally well. Also, if you are using Outlook, you can create a public folder on the Exchange server, and set it to replicate with your laptop's Outlook. Then every posts email type messages to the folder. They aren't sent anywhere, but they are replicated offline to any subscribers. If the data is sensitive, then "public" folders can have appropriate security.