<p>Thunderbird isn&rsquo;t clunky anymore. Lots of investment is going into this great email, calendar, contacts, and more desktop client.</p>
<p>You can download Thunderbird from their <a href="https://www.thunderbird.net/en-US/download/">website</a>.</p>
<p>The steps for configuring Thunderbird are practically the same for the major desktop platforms. Use the standard installation options and allow Thunderbird to be your default mail application.</p>
<p>You&rsquo;ll be asked to enter your Federated Core email address. Thunderbird <em>should</em> auto-configure your settings, but if you need to manually set them up, here is the needed information:</p>
<p>In order to connect Thunderbird to the addresses kept in your Nextcloud application, select the small address book icon in the upper right of Thunderbird to select the &ldquo;Address Book&rdquo; mode.</p>
<p>You need to get the link for the &ldquo;Location&rdquo; line. This can be found in Nextcloud. Open a browser, enter the nextcloud.domain.com address for your Federated Core where &ldquo;domain.com&rdquo; is your particular domain name, navigate to the Contacts application, and then Contacts Settings in the lower left of the window. You&rsquo;ll see a window like this:</p>
<p>You click on the three dots in the &ldquo;Address books&rdquo; section to see a drop down menu. Select &ldquo;Copy link&rdquo;. That is the link address we need for the &ldquo;Location&rdquo; in the prior dialog box in Thunderbird. You can switch back to Thunderbird and paste the link into the &ldquo;Location&rdquo; section of the dialog box then click &ldquo;Continue&rdquo;.</p>
<p>Now Thunderbird will ask you to authenticate to your Nextcloud application.</p>
<p>Enter your username (email address for Federated Core) and password. Click &ldquo;OK&rdquo; and you should have your Address Book from Nextcloud now connected to Thunderbird.</p>
<p>These instructions work for any Calendar in your Nextcloud application. You can have Calendars for yourself/personal, decks, task lists, etc.</p>
<p>We will be adding a CalDAV calendar to Thunderbird. First switch to the Calendar mode in Thunderbird by clicking the calendar icon along the right side of the Thunderbird application.</p>
<p>We choose from the next dialog box to subscribe to a &ldquo;On the Network&rdquo; calendar and click &ldquo;Next&rdquo;.</p>
<p>In order to find the &ldquo;Location&rdquo; we need to switch to our Nextcloud application and navigate to the &ldquo;Calendar&rdquo; app.</p>
<p>You select the calendar you want to subscribe to by clicking on the &ldquo;edit&rdquo; function. Another dialogue box is presented:</p>
<p>Click on the &ldquo;Copy private link&rdquo; buttton to copy the desired &ldquo;Location&rdquo; to the clipboard. Now we can go back to Thunderbird and paste the link into the &ldquo;Location&rdquo; box and click &ldquo;Find Calendars&rdquo;.</p>
<p>When Thunderbird finds the calendar, it will ask us for our password for Nextcloud.</p>
<p>Leave the &ldquo;Calendar Type&rdquo; as &ldquo;CalDAV&rdquo; and click &ldquo;Subscribe&rdquo;. Your calendar is now available in Thunderbird.</p>
<p>Connecting your entire Ubuntu-based operations system (such at Ubuntu or Pop OS) is very easy.</p>
<p>Open your &ldquo;Settings&rdquo; application and then select the &ldquo;Online Accounts&rdquo; section of &ldquo;Settings&rdquo;.</p>
<p>When you select &ldquo;Nextcloud&rdquo; you&rsquo;ll be given a dialog box to enter in the specific information for your Federated Core.</p>
<p>The &ldquo;Server&rdquo; is &ldquo;<a href="https://nextcloud.domain.com">https://nextcloud.domain.com</a>&rdquo; when &ldquo;domain.com&rdquo; is your domain. The &ldquo;username&rdquo; is your email address for your Federated Core. And the &ldquo;Password&rdquo; is your password for Federated Core.</p>
<p>Now your files, email, calendars will &ldquo;automatically&rdquo; work with the applications that are part of your Ubuntu-based distribution.</p>
<p>Note: you will have to separately configure Thunderbird. See the documentation for those instructions.</p>