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6 Steps to Successful Outlook Calendar Availability Not Showing

In the dynamic realm of modern business, where every minute counts, efficient communication is the linchpin for success. Microsoft Outlook stands tall as a key player in this domain, and its calendar feature is a vital tool for seamless collaboration. However, imagine the frustration when your Outlook calendar availability refuses to reveal itself to your colleagues, leading to scheduling chaos and missed appointments. Fear not! In this comprehensive guide, we delve into the common conundrum of Outlook calendar availability not showing and present you with a meticulous six-step solution to reclaim control over your scheduling woes.

The Challenge:

When users find that their Outlook calendar availability is not showing to colleagues, it can lead to scheduling conflicts, missed appointments, and overall inefficiencies in team coordination. There could be various reasons why you’re unable to view someone’s free/busy information in Outlook:

  • The attendee is not part of your organization. Outlook cannot display free/busy or scheduling information for individuals outside your organizational network.
  • You’re organizing a meeting in a calendar that is not within your organization. For instance, if you have both a Microsoft 365 email account and a Gmail account configured in Outlook, and you use the Gmail email address in the meeting request’s From field, you won’t have access to free/busy information for attendees. Make sure to set the From field to your Microsoft 365 or organizational email account.
  • Outlook imposes limits on the number of attendees in a distribution list for which it can show free/busy information. If you encounter issues while adding a distribution list that exceeds this limit, the free/busy check may fail. Consider expanding the distribution list to enable Outlook to retrieve the free/busy information for attendees.
  • Similarly, Outlook has a cap on the number of attendees in a meeting for which it can display Free/Busy information. To check free/busy information for a larger group, consider creating a second meeting for a smaller set of individuals.

The Fix:

The solution to this problem involves migrating the mailbox back to Exchange on-premises and then back to Exchange Online. While this may seem like a complex process, following these step-by-step instructions can help you address the calendar availability visibility issue effectively:

Step 1: Migrate the mailbox to Exchange on-premises

Utilize the migration wizard in the EAC within Exchange Online for a seamless transfer of existing cloud mailboxes to your on-premises Exchange organization:

  • Head to the EAC, find Migration, and click Add migration batch.
Outlook calendar availability not showing
  • Give your migration batch a friendly name, choose Migration from Exchange Online.
  • On the migration endpoint page, select the Fully Qualified Domain Name (FQDN) like “”. Hit Next.
  • Time to add some user mailboxes! Pick the Exchange Online users you want to move to the on-premises organization and click Next.
  • Select the target delivery domain, usually the domain for both on-premises and Exchange Online (e.g., techieberry.mail.onmicrosoftcom).
  • Decide whether to move the archive mailbox, and specify the Target database (like Techieberry-DB01). Click Next.
  • Now, for the Schedule batch migration page, select someone to get the batch complete report. Make sure Automatically start the batch is checked, and consider ticking the Manually completing the batch later box.
  • ClickSave.

Step 2: Verify calendar availability

Once the migration is complete, verify that the user’s calendar availability is now visible to others within the on-premises environment. This step ensures that the issue is indeed resolved at the on-premises level.

Step 3: Remove completed migration batches

Once your mailbox moves have successfully concluded, it is advisable to remove the completed migration batches. This step helps minimize the chances of errors, especially if you plan to move the same users again in the future.

To remove a completed migration batch:

  • Open the EAC and navigate toMigration.
  • Click a completed migration batch, and then clickDelete.
  • In the confirmation dialog for deletion, go ahead and click Yes.

Step 4: Migrate the mailbox back to Exchange Online

  • Pop over to the EAC, find your way to Migration, and hit Add migration batch.
  • Give your migration batch a name that brings joy to your day. Choose Migration to Exchange Online.
  • On the Select the migration type page, choose the magic of Remote move migration and click Next.
  • Skip through the Prerequisites for remote migration page like you’re taking a leisurely stroll. Click Next.
  • Now, on the migration endpoint page, pick the Fully Qualified Domain Name (FQDN). Let’s call it something snazzy, like “”. Click Next.
  • On the Add user mailboxes page, pick the lucky user heading off to Microsoft 365 and click Next.
  • Choose your Target delivery domain. Something like techieberry.mail.onmicrosoft should do the trick. Click Next.
  • Time to schedule the batch migration on the Schedule batch migration page. Select someone (maybe yourself) to receive that batch complete report. Make sure Automatically start the batch is your wingman, and consider checking the Manually completing the batch later box if you’re feeling spontaneous.
  • Wrap it up by clicking on Save.

Step 5: Verify and monitor

Following the migration back to Exchange Online, verify that the user’s calendar availability is now visible to others. Monitor the situation for any recurrence of the visibility issue, and address any additional concerns as needed.

Step 6: Delete migrated batches

Once your mailbox migrations have finished, it is advisable to delete the migrated batches to reduce the chance of errors in case the same users need to be moved again.

Resolving Outlook calendar availability not showing to others may require a strategic approach, and migrating the mailbox back and forth between Exchange on-premises and Exchange Online is a proven solution. By following these steps carefully, organizations can ensure seamless collaboration and communication among team members, ultimately fostering a more productive work environment.

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