We do have a way to recover old project files. In the data directory IntelliGantt uses is a simple Access database that contains the list of projects IntelliGantt knows about. One of the columns in this Access database is the directory path where the IntelliGantt project resides. You should be able to open the TDP.MDB file and manually change the path to a server that is available. You should literally see a directory path in the Workspaces table of the access db file.
Now this assumes that roaming profiles were being used, in which case I'm assuming that your network data will still be available even though that server went down. However, if all your project data was in fact stored on that server then its plan B.
Plan B is you always have a copy of every project on your local machine. However, you will have to edit the MDB file so that a) the shared path information is removed and b) the 'shared' flag is set to false. This means you'll have to re-invite everyone to your project again, but the good news is it will be available again.
If you'd like, you can send the tdp.MDB file to
support@teamdirection.com and we will update it for you. It should be located in
C:\Documents and Settings\<user account>\Application Data\TeamDirection\TDProject