I guess in a way you are lucky. None of the library upgrades killed your DB, because I know that some of the Windows upgrades did some things to A LOT of the .DLL files. Not to mention (if you used any) the .OCX files.
The BE has nothing to do with the FE as long as you are using Access as the FE. As long as the RDBMS supports ODBC, Access can use it. Do NOT confuse Access the RAD tool with Jet and ACE the desktop database engines.
Not sneering. Just not something we want to do anymore. It did serve us very well. We were able to do some amazing things. We just can't keep it up anymore. Plus integrating it into our erp wasn't a perfect solution. The 10 year plan is to put the stuff that we developed in house - into our erp. It certainly not going to be as flexible - but sometimes we try to program to every possible contingency.