Hi,
Question 1:
You cannot perform a upgrade in place because Exchange and adconnect don't support the upgrade in-place.
I recommend you to perform the following steps:
- Install new machine with supported operating system by th target version of adconnect
- Export adconnect configuration settings from the old server
- On this new server, install adconnect server in staging mode (don't forget to import settings exported from old server)
- Move the old adconnect server to staging mode
- Disable the staging mode on new adconnect server
- Remove adconnect server from old server.
Question 2:
No impact on your hybrid environment ,if you follow my suggestion, because you will keep the same adconnect configuration.
Please don't forget to mark helpful answer as accepted