How are other firms/companies handeling upgrading older Revit projects that have been completed and built and the Revit file has been archived? Should these files be upgraded with every year with each new release if have the potential to be needed for future additions / renovations or just needs to be accessed? How many past version can the newest Revit upgrade; i.e. will 2011 upgrade an 8.0 version or earlier?
I am curious how others are handling this process for projects in older Revit versions.