Carbonio is a business email and collaboration platform from Zextras, an Italian software company. It brings email, calendar, chat, video meetings, files and administration into one workspace and is aimed at organisations that want control over their infrastructure and data. According to the vendor, the product can be installed on-premises, run in a private cloud, or used as a sovereign SaaS offering through certified partners. Its core relies on open standards such as SMTP, IMAP, CalDAV and CardDAV.
Zextras S.r.l. is registered in Italy, in the province of Vicenza, and the vendor's public pages do not name a foreign parent company. The vendor describes Carbonio as open-core rather than fully open source: the commercial editions add features such as commercial antivirus and hardware security module support. Because the software can run on the customer's own infrastructure, a European organisation can keep mail and documents under its own jurisdiction. Where a partner operates a sovereign SaaS instance, the hosting location and contract terms should be confirmed with that partner.