Table of Contents<\/strong><\/p>\n Since shared mailboxes are a vital part of Office 365’s collaboration tools, their absence can significantly disrupt professional workflows.<\/p>\n Therefore, we have made this guide which provides detailed instructions to help you restore visibility of shared mailboxes and their subfolders. However, before we begin it is better to lay out the possible causes of this issue first, as this will make the solutions easier to understand.<\/p>\n Here is a list of the most common situations:<\/p>\n Technical Glitch\/Sync issues:<\/b> Under poor network conditions or when running older devices Outlook can struggle to reflect all changes instantaneously.<\/p>\n So we recommend waiting a few minutes and letting the issue resolve automatically. If this does not work, close the current instance and reopen the app again. Pair this with a login-logout activity.<\/p>\n Cluttered Folder Structure:<\/b> The biggest culprit for users is a clumsy Outlook dashboard. Anything from improper hierarchy to loads of unnecessary subfolders can fill up the navigation pane. This makes it quite difficult to locate the missing shared mailbox.<\/p>\n Access not given: <\/b>Admins may have mistakenly chosen the wrong person while assigning permissions. There is a high chance for this to happen if there are multiple people with the same name. If you think a mistake has been made, inform the admin about the issue.<\/p>\n Shared Mailbox Limit Breached: <\/b>Even though there is no hard limit on how many people can have access to a shared mailbox, it is an industry-standard to keep the number below 25. Moreover, shared mailbox oversubscription is known to cause many issues, including it becoming invisible.<\/p>\n Access revoked:<\/b> It is also possible that earlier a user had access to the shared mailbox but due to some internal policy changes, it was taken away. This will result in the shared mailbox disappearing on its own. Moreover, if users believe this is the case, then they should take a look at their primary mailbox, it should contain a message informing them about the changes.<\/p>\n Shared Mailbox Deleted: <\/b>Other than that, the permanent removal of a shared mailbox from the admin center is why users can’t find it. This can also occur if a shared mailbox is reconverted to a user mailbox.<\/p>\n There are 3 methods available at User Level:<\/p>\n 1. Generate and Check Logs<\/b><\/p>\n 2. Manually Add Shared Mailbox Folders Not Showing up in Outlook 365 Classic<\/strong><\/p>\n 3. Is Shared Mailbox Still Not Visible in Outlook? Try to Recreate Profile<\/b><\/p>\n Note that if users don’t solve the issue then they won’t be able to export the distribution list to Excel Office 365<\/a> at all.<\/p>\n Other alternative approaches include:<\/p>\n If Shared Mailbox Missing from Outlook Web <\/b> For admins, the steps differ a bit:<\/p>\n First log in to the admin center > toggle Teams & groups > Go to Shared mailbox > Click on Add a Shared Mailbox > type the name and set the domain > Hit Save changes.<\/p>\n Populate the member list and ask the members to add the mailbox in their individual account.<\/p>\n First up ensure that you have logged in via a business account and not a private one. This is because the private account cannot add\/view shared mailboxes. Then proceed with these steps:<\/p>\n Recheck all the mailboxes below the home icon if everything is working, you should find your shared mailbox right there.<\/p>\n If you face issues like shared mailbox folders not showing up in Outlook 365 again, then use the series of steps given below. These are valid for both Android and iOS devices.<\/p>\n This should make the shared mailbox appear on your Outlook mobile app.<\/p>\n If you are an admin whose users complain about missing shared folders in M365 then you can deploy the custom scrips provided here to resolve the problem.<\/p>\n Step 1:<\/strong> Create a CSV Map<\/strong> of all Shared Mailboxes<\/strong> and Corresponding Users<\/strong><\/p>\n Admins should begin the task by identifying which shared mailboxes are not appearing in Outlook. This command identifies the shared mailboxes and lists users with only the Full Access permissions. You may edit the script to broaden the search\/ list criteria to include other access rights levels.<\/p>\n Now that you have the documentation for all shared mailboxes, we can move on to the next step.<\/p>\n Step 2: Revoke and Reassign<\/strong> Permissions The final step is to be done by users. Instruct them to manually add the shared mailbox to Outlook guaranteeing a solid connection. Save these scripts to quickly detect and diagnose shared mailboxes disappearing from Outlook in the future.<\/p>\n If you suspect that any one of your add-ins is the reason why you can’t see or interact with the shared mailboxes try starting Outlook in safe mode<\/strong><\/p>\n You have a particular build of Outlook then the issue may be specific to your build.<\/p>\n Check Build Number and Deploy a Registry Level Fix<\/strong><\/p>\n The answer to that is simple, create a backup. Having an offline copy of regular mail is common but the same can’t be said for the shared mailboxes. As multiple users have access to this entity, every user is under the impression that someone else has a backup.<\/p>\n However, if every shared mailbox access holder thinks like that, then no one prepares a backup and in case of a mass missing request, all the shared mailbox conversations are lost for good.<\/p>\n Don’t worry, you need not download each email individually; instead, there is a way better solution tailor-made to make the backup process as easy as possible. It is the Systools Office 365 Backup tool<\/b>. This piece of software comes with all sorts of filters and features to create an offline copy of every important thing inside a shared mailbox.<\/p>\n Download Now<\/a> Purchase Now<\/a><\/p>\n Especially if it’s the admin who has lost access, so use this straight path to diminish the effect of missing shared folders.<\/p>\n Download a copy > Choose Endpoints > Select Workload > Apply Date Filter > Validate Source > Pick a Destination > Map Users > Preview and Backup.<\/p>\n\n
Reasons Why Shared Mailboxes Disappear in Outlook<\/h2>\n
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<\/p>\nUndo Shared Mailbox Folders Not Showing up in Outlook Classic<\/h2>\n
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<\/li>\nUse Outlook Web as a Possible Solution<\/h3>\n
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\nThe same steps can be replicated in Outlook’s new desktop variant, as their GUI is almost identical.<\/p>\n![\"Admin](\"https:\/\/www.systools.in\/blog\/wp-content\/uploads\/2024\/07\/admin-center-1.webp\")
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<\/p>\nFix Shared Mailbox Missing from Outlook Mobile App<\/h3>\n
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How Admins Can Use PowerShell to Fix User Shared Mailbox Not Showing in Outlook New or Classic?<\/h3>\n
\nTo make the process easier we have a sample PowerShell command that can retrieve all shared mailboxes along with their assigned permissions, and export the results in CSV:<\/p>\n# Define the CSV path\r\n$CsvPath = \"C:\\Temp\\SharedMailboxPermissions.csv\"\r\n\r\n# Collect permissions dynamically\r\n$ExportData = @()\r\nGet-Mailbox -RecipientTypeDetails SharedMailbox | ForEach-Object {\r\n$SharedMailbox = $_.PrimarySmtpAddress\r\n$Permissions = Get-MailboxPermission -Identity $_.Identity | Where-Object {\r\n($_.AccessRights -eq \"FullAccess\") -and ($_.IsInherited -eq $false)\r\n}\r\nforeach ($Permission in $Permissions) {\r\n$ExportData += [PSCustomObject]@{\r\nSharedMailbox = $SharedMailbox\r\nUser = $Permission.User\r\nAccessRights = ($Permission.AccessRights -join \",\")\r\n}\r\n}\r\n}\r\n\r\n# Export to CSV\r\n$ExportData | Export-Csv -Path $CsvPath -NoTypeInformation -Encoding UTF8\r\nWrite-Host \"Permissions exported to $CsvPath\"<\/pre>\n
\nThis is the step where we first disconnect and then reconnect users with their corresponding shared mailboxes but keep auto mapping disabled.
\nIt is done to rule out the possibility of a non-working auto-discovery<\/a> feature. Make use of the same exported CSV file for this process:<\/p>\n# Import the CSV\r\n$Permissions = Import-Csv -Path \"C:\\Temp\\SharedMailboxPermissions.csv\"\r\n\r\n# Loop through permissions and update\r\nforeach ($Permission in $Permissions) {\r\n$SharedMailbox = $Permission.SharedMailbox\r\n$User = $Permission.User\r\n\r\nWrite-Host \"Processing $User for $SharedMailbox\"\r\n\r\n# Revoke permissions\r\nRemove-MailboxPermission -Identity $SharedMailbox -User $User -AccessRights FullAccess -Confirm:$false\r\n\r\n# Reassign permissions without AutoMapping\r\nAdd-MailboxPermission -Identity $SharedMailbox -User $User -AccessRights FullAccess -AutoMapping:$false\r\n\r\nWrite-Host \"Permissions updated for $User on $SharedMailbox\"\r\n}<\/pre>\nAdvanced Solutions to Shared Mailbox Folders Not Showing up in Outlook 365<\/h3>\n
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What to Do After Successfully Retrieving Shared Mailboxes in Outlook?<\/h4>\n
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