When was Progress DB 9.1 and 9.1D released?

[RLH]

I have an old application that I manage that runs on top of a progress database. I'm trying to gather some information, for various reasons. At a minimum, I need to know when Progress 9.1 and 9.1D were released. I mention these two versions because we are using 9.1D and, I assume, the "D" revision is probably just the fourth iteration in miner updates since the initial release of 9.1.

Optimally, I'd like to find a source-link to a Progress DB change log. However, questions for documentation aren't typically acceptable around here. Instead, I'm asking for the date these versions were released and requesting that you provide a source that I can explore further.

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