DavMail 7.0.0, a Java-based gateway, now routes most of its work through Microsoft Graph, according to Help Net Security. The tool acts as a translator between open protocols that many mail, calendar, and contact apps use and the proprietary APIs behind Exchange and Office 365.
For anyone who wants to stop using Outlook but still has a mailbox on Exchange, DavMail provides a path. The new version's emphasis on Microsoft Graph suggests a continued commitment to keeping that path viable as Microsoft shifts more of its backend to cloud-based APIs.
The source notes that DavMail supports IMAP, SMTP, CalDAV, CardDAV, and LDAP on one side, converting those requests into something Exchange and Office 365 understand. This is a single-source report, so there are no contrasting views to compare, but the security and privacy relevance is clear: users can maintain control over their mail client choice while still relying on an Exchange backend.