{"id":6098,"date":"2025-12-04T15:08:42","date_gmt":"2025-12-04T13:08:42","guid":{"rendered":"https:\/\/www.msb365.blog\/?p=6098"},"modified":"2025-12-24T10:38:07","modified_gmt":"2025-12-24T08:38:07","slug":"setting-up-calendar-sharing-between-microsoft-365-tenants","status":"publish","type":"post","link":"https:\/\/www.msb365.blog\/?p=6098","title":{"rendered":"Setting Up Calendar Sharing Between Microsoft 365 Tenants"},"content":{"rendered":"<style>\n    \/* Container Styling um Konflikte mit dem Theme zu vermeiden *\/<br \/>\n    .custom-blog-post {<br \/>\n        font-family: Arial, sans-serif;<br \/>\n        line-height: 1.6;<br \/>\n        margin: 20px auto; \/* Zentriert den Inhalt *\/<br \/>\n        max-width: 800px;<br \/>\n        color: #333;<br \/>\n    }<\/p>\n<p>    \/* \u00dcberschriften innerhalb des Posts *\/<br \/>\n    .custom-blog-post h1,<br \/>\n    .custom-blog-post h2,<br \/>\n    .custom-blog-post h3 {<br \/>\n        color: #333;<br \/>\n        margin-top: 1.5em;<br \/>\n        margin-bottom: 0.5em;<br \/>\n    }<\/p>\n<p>    \/* Code Schnipsel *\/<br \/>\n    .custom-blog-post code {<br \/>\n        background: #f4f4f4;<br \/>\n        padding: 2px 4px;<br \/>\n        border-radius: 4px;<br \/>\n        font-family: monospace;<br \/>\n        color: #d63384; \/* Klassische Code-Farbe *\/<br \/>\n    }<\/p>\n<p>    \/* Code Bl\u00f6cke *\/<br \/>\n    .custom-blog-post pre {<br \/>\n        background: #f4f4f4;<br \/>\n        padding: 15px;<br \/>\n        border-left: 5px solid #ccc;<br \/>\n        overflow-x: auto;<br \/>\n        margin-bottom: 20px;<br \/>\n    }<\/p>\n<p>    .custom-blog-post pre code {<br \/>\n        background: transparent;<br \/>\n        padding: 0;<br \/>\n        color: #333;<br \/>\n    }<\/p>\n<p>    \/* Listen *\/<br \/>\n    .custom-blog-post ul,<br \/>\n    .custom-blog-post ol {<br \/>\n        margin-left: 20px;<br \/>\n        margin-bottom: 20px;<br \/>\n    }<\/p>\n<p>    .custom-blog-post ul {<br \/>\n        list-style-type: disc;<br \/>\n    }<\/p>\n<p>    \/* Abs\u00e4tze *\/<br \/>\n    .custom-blog-post .blog-section {<br \/>\n        margin-bottom: 20px;<br \/>\n    }<\/p>\n<p>    .custom-blog-post strong {<br \/>\n        font-weight: bold;<br \/>\n    }<br \/>\n<\/style>\n<div class=\"custom-blog-post\">\n<h2>Introduction<\/h2>\n<p class=\"blog-section\">In today&#8217;s interconnected business world, collaboration across organizations is essential. Microsoft 365 offers robust tools for cross-tenant calendar sharing, allowing users from different tenants to view availability (free\/busy) or even full calendar entries. This guide walks you through the setup process, drawing from official Microsoft documentation and practical examples. We&#8217;ll cover free\/busy sharing via organization relationships and full calendar access, which requires enabling external sharing and per-user configurations.<\/p>\n<h2>Possible Scenarios for Cross-Tenant Calendar Sharing<\/h2>\n<p class=\"blog-section\">Cross-tenant sharing is useful in various contexts. Here are some common scenarios:<\/p>\n<ul>\n<li><strong>Business Partnerships:<\/strong> Two companies collaborating on a project need to schedule meetings without conflicts. Free\/busy sharing ensures visibility into availability, while full sharing allows detailed event insights for closer coordination.<\/li>\n<li><strong>Mergers and Acquisitions:<\/strong> During integration, teams from acquired and parent companies can share calendars to align on timelines, reducing miscommunication.<\/li>\n<li><strong>Supply Chain Management:<\/strong> Vendors and clients can view each other&#8217;s schedules for deliveries or reviews, enhancing efficiency.<\/li>\n<li><strong>Hybrid Work Environments:<\/strong> Freelancers or consultants from external tenants can integrate calendars for seamless booking.<\/li>\n<li><strong>Multi-Tenant Organizations (MTO):<\/strong> In advanced setups like MTO, sharing extends to groups, but starts with basic free\/busy for all users.<\/li>\n<li><strong>Challenges in Regulated Industries:<\/strong> Sectors like finance or healthcare may limit to free\/busy only for compliance, avoiding full entry details.<\/li>\n<\/ul>\n<p class=\"blog-section\">Note: Full sharing beyond free\/busy isn&#8217;t automated tenant-wide; it&#8217;s user-initiated. For large-scale needs, consider automation scripts or policies.<\/p>\n<h2>Prerequisites<\/h2>\n<ul class=\"blog-section\">\n<li>Global or Exchange Admin permissions in both tenants.<\/li>\n<li>Access to Microsoft 365 Admin Center and Exchange Admin Center.<\/li>\n<li>Exchange Online PowerShell module for advanced setups.<\/li>\n<li>Domain names of both tenants (e.g., contoso.com and fabrikam.com).<\/li>\n<li>Changes may take up to 24 hours to propagate.<\/li>\n<\/ul>\n<h2>Step-by-Step Setup<\/h2>\n<h3>Step 1: Enable External Calendar Sharing (Required for Full Access)<\/h3>\n<p class=\"blog-section\">This allows users to share calendars externally.<\/p>\n<ol>\n<li>Log into the Microsoft 365 Admin Center (admin.microsoft.com).<\/li>\n<li>Go to <strong>Settings &gt; Org settings &gt; Services &gt; Calendar<\/strong>.<\/li>\n<li>Enable <strong>Let your users share their calendars with people outside of your organization who have Office 365 or Exchange<\/strong>.<\/li>\n<li>Select access levels (e.g., full details).<\/li>\n<li>Save and repeat in the other tenant.<\/li>\n<\/ol>\n<h3>Step 2: Set Up Organization Relationship (for Free\/Busy Sharing)<\/h3>\n<p class=\"blog-section\">This enables tenant-wide visibility of availability. Perform in both tenants for bidirectional access.<\/p>\n<h4>Using Exchange Admin Center<\/h4>\n<ol>\n<li>Log into Exchange Admin Center (admin.exchange.microsoft.com).<\/li>\n<li>Navigate to <strong>Organization &gt; Sharing &gt; Organization sharing tab<\/strong>.<\/li>\n<li>Click <strong>+ Add organization relationship<\/strong>.<\/li>\n<li>Enter a name (e.g., &#8220;Contoso-Fabrikam&#8221;).<\/li>\n<li>Add the other tenant&#8217;s domain.<\/li>\n<li>Enable <strong>Calendar free\/busy information sharing<\/strong>.<\/li>\n<li>Choose level: Time only or Time, subject, location.<\/li>\n<li>Select scope: Everyone or a security group.<\/li>\n<li>Create and repeat in the other tenant.<\/li>\n<\/ol>\n<h4>Using PowerShell<\/h4>\n<ol>\n<li>Connect:\n<pre><code>Connect-ExchangeOnline -UserPrincipalName admin@contoso.com<\/code><\/pre>\n<\/li>\n<li>Create:\n<pre><code>New-OrganizationRelationship -Name \"Contoso-Fabrikam\" -DomainNames \"fabrikam.com\" -FreeBusyAccessEnabled $true -FreeBusyAccessLevel LimitedDetails<\/code><\/pre>\n<\/li>\n<li>Verify:\n<pre><code>Get-OrganizationRelationship | Format-List<\/code><\/pre>\n<\/li>\n<\/ol>\n<h3>Step 3: Perform Full Calendar Sharing (Per-User)<\/h3>\n<p class=\"blog-section\">Once external sharing is enabled:<\/p>\n<ol>\n<li>In Outlook, right-click your calendar and select <strong>Share &gt; Permissions<\/strong>.<\/li>\n<li>Add the external user&#8217;s email.<\/li>\n<li>Set permissions (e.g., Can view all details).<\/li>\n<li>Send invitation; recipient accepts in Outlook.<\/li>\n<li>To view: Add the shared calendar via link or invitation.<\/li>\n<\/ol>\n<h2>Verification and Troubleshooting<\/h2>\n<p class=\"blog-section\">Test by inviting cross-tenant users to meetings. If issues arise, check domains, wait for propagation, or use PowerShell diagnostics. For advanced scenarios like MTO, refer to Microsoft docs.<\/p>\n<h2>Conclusion<\/h2>\n<p class=\"blog-section\">Cross-tenant calendar sharing boosts productivity but requires careful setup for security. Start with free\/busy for broad access, then enable full sharing as needed. Stay updated with Microsoft changes!<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Introduction In today&#8217;s interconnected business world, collaboration across organizations is essential. Microsoft 365 offers robust tools for cross-tenant calendar sharing, allowing users from different tenants to view availability (free\/busy) or even full calendar entries. This guide walks you through the setup process, drawing from official Microsoft documentation and practical examples. We&#8217;ll cover free\/busy sharing via [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":6101,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_crdt_document":"","om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[2,3],"tags":[],"class_list":["post-6098","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-exchange","category-powershell"],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/www.msb365.blog\/index.php?rest_route=\/wp\/v2\/posts\/6098","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.msb365.blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.msb365.blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.msb365.blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.msb365.blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=6098"}],"version-history":[{"count":3,"href":"https:\/\/www.msb365.blog\/index.php?rest_route=\/wp\/v2\/posts\/6098\/revisions"}],"predecessor-version":[{"id":6105,"href":"https:\/\/www.msb365.blog\/index.php?rest_route=\/wp\/v2\/posts\/6098\/revisions\/6105"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.msb365.blog\/index.php?rest_route=\/wp\/v2\/media\/6101"}],"wp:attachment":[{"href":"https:\/\/www.msb365.blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=6098"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.msb365.blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=6098"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.msb365.blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=6098"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}