https://petemahon.net/tags/shared-mailboxes/Recent content in Shared-Mailboxes on PeteMahon.netHugoen-us<a href="https://creativecommons.org/licenses/by-nc/4.0/" target="_blank" rel="noopener">CC BY-NC 4.0</a>Mon, 27 Apr 2026 08:00:00 +0400https://petemahon.net/posts/multiple-m365-mailboxes-one-proton-license/Mon, 27 Apr 2026 08:00:00 +0400https://petemahon.net/posts/multiple-m365-mailboxes-one-proton-license/<p><em>If you&rsquo;ve arrived here from a search engine looking specifically for the shared-mailbox question, the short version is: yes, you can migrate two M365 mailboxes onto one Proton license, and you do it by temporarily moving the license between users in M365 rather than buying a second seat anywhere. The longer version assumes you&rsquo;ve already done the basic Proton setup - both custom domains added and verified, MX records pointing at Proton, your primary mailbox already imported via Easy Switch. If any of that isn&rsquo;t true, the <a href="https://petemahon.net/posts/migrating-inbox-from-m365-to-proton/">previous post</a> covers the standard single-mailbox flow first.</em></p>