• Emails will likely go to mailbox.org, only with the web interface (no client).
• Computers are moving to Ubuntu.
• CRM is currently still Hotspot, but we will likely move away next year.
• Cloud solution is NextCloud with a small server on premise (we don't have very large data, besides CAD, which are on Dassault's cloud).
• Project management is moving to open project.

My plan is to move to odoo as ERP and build up our infrastructure progressively.

Regarding to software, I'd rather pay developers for ad hoc solutions, than for licenses. I think I'll need to hire one guy dedicated to this.

My network-guy is a good friend who doesn't charge too much for now.

All in all, it's going to be a bit more expensive in the beginning.