I just today (9/28) installed High Sierra. I got a message that the DEVONthink Mail plugin was incompatible so it was disabled. I should have screen captured it, but dismissed it before I thought to do that.
I have the latest version of DEVONthink Pro, 2.9.15.
This is on a 2015 MacBook Pro, macOS High Sierra 10.13, 8 GB RAM, 128GB SSD.
When is this going to be fixed?
You guys have had High Sierra betas available since July, and I expected you would be ready for High Sierra.