From memory when you purchased Access 97 you used to get a free 90 day support with it. This went down to 3 calls. Then about 2002 they stopped selling it and 1 yeaer after that stopped suppporting it. Although you can still get Access 97 articles from the KB.
i always have my backend dbs's in A97 - they seem to work far more quickly than later versions, whatever the front end is. I definitely find A97 is quicker, but some clients have later versions. In general, there is very little functionality missing from A97
The main difference with A97 and latter is the code page setting. A97 operates on a 64bit size whilst higher version use 126bit this is why bloating is more evident in latter versions.