This is worth clarifying slightly.
It is true that the Field is an end-of-life product, and it's also true that most Field hardware was manufactured with components that could only run in 32-bit mode, which excludes support for EditShare 6. (This is a detail I had forgotten about when responding previously; sorry about the confusion there.)
However, some of the later Field models were built with 64-bit capable hardware, and so could indeed be upgraded to the EditShare 6, up to & including EditShare 6.1.3.3, the current version as of this writing with the best currently-available compatibility with recent versions of Mac OS X, Windows, Avid, Final Cut, Premiere, et cetera.
Without having your system details to hand, I'm not sure if this information does you any good or not. If we could get access to the server, or if diagnostics could be mailed to us at support at editshare dot com, we could help clarify the potential upgrade options for this server.
Hope this helps.
--
Chris Devers
EditShare Tech Support
support ( at ) editshare • com
http://editshare.com
Twitter:
@EditShare &
@ESLightWorks