I have upgraded eight of my databases to 8.5 and one is still in 7.2. half of them each process about 400k records each month and many calculations. All i am saying is the are important to me. Is it safe to move them to DataEase 9 for Windows? What advantages exit for doing so?

LE9/DE9 is one of the biggest updates ever in DataEase history.

Its split in two simply due to the difficulty of sustaining backwards compatibility when the history is 40 years, so the focus in LE9 is to support existing Legacy applications when the goal in DE9 is to move away from the legacy approach.

You can download LE9 from here to have a test:
There is an application included that showcase some of the news in LE9.
We will publish an exhaustive list and examples on how to use the new features when we fully release the product.

https://www.dataease.com/static/files/LegEasyFull-...

May be DE9 new features will help us to predict missile attacks on Ukraine by using solar activity data. 

Example of the data mentioned  best use, it is a pity, but DE was not used... :

Best Use of Data Award: Storm Prophet

2023 NASA International Space Apps Challenge

btw, 40 yars ago DataEase had worldwide usage for governments, hospitals and ...don't be surprised, in NASA

btw, 40 years ago DataEase had worldwide usage for governments, hospitals and ...don't be surprised, in NASA