Hi,@Marco Massasso
Thanks for posting your question in the Microsoft Q&A forum.
Based on the information you've provided so far, I currently have some questions about the circumstances of your Exchange.
1.Do you currently only have On-pre Exchange?
2.If you want to use Exchange Online, why not consider migrating your entire mailbox to Exchange Online? If users are all Online, there will be no need for a third party to perform maintenance; Microsoft is responsible for Exchange Online maintenance.
3.Can you describe what you're doing this for?