There are several computers working on a server and two other employees were working on the same indesign document at the same time, causing both of them to suddenly crash and then the file became corrupted. When I try and open the document I get the error message 'cannot add data to unknown document'. I still get the same message even when trying to open the file from my desktop. I am using CS5.5 and am on an imac....
I have tried to find a solution to this in the threads, but so far no luck! Have also tried to call Adobe but they were no help . Any assistance would be greatly appreciated.
First off, two people shouldn't have the ability to work on the same file at the same time. That was a bug in the initial release of CS5 or CS5.5 (not sure which) but it was fixed in the first patch. If you haven't updated to 7.5.3 you need to do that to prevent future problems and take advantage of other bug fixes.
As far as your file, it doesn't sound all that hopeful. Try opening as a copy. If that doesn't work you may have to rebuild, or if more cost effective, use the Markzware recovery service: Bad InDesign or Quark File Recovery Submission Form
If you are patched, and you still have problems with multiple users using the same file, there's some other serious problem, like your server isn't letting ID write the lock file, and you need to find out waht that might be.