How to Share Outlook Tasks: Desktop vs. Outlook on the Web Limitations
Question details
User is unable to open a shared Outlook Tasks folder in Outlook on the web when it is shared from an Outlook Desktop client.
- Product
- Microsoft Outlook
- Device & OS
- not provided
- Scenario
- Attempting to share an Outlook Tasks folder between an Outlook 2019 Desktop user and a Microsoft 365 Business Basic user accessing Outlook on the web.
- Observed behavior
- The web recipient receives an email with sharing instructions but no usable folder attachment to access the shared tasks.
Verify which versions of Outlook both the sender and the recipient are using, as task sharing capabilities differ significantly between Outlook Desktop and Outlook on the Web.
Understand Outlook on the Web Task Sharing Limitations
Outlook on the Web does not currently support opening shared task folders originating from Outlook Desktop.
Task folder sharing in Microsoft's ecosystem relies on specific protocols that are currently only fully supported between Outlook Desktop clients. When a desktop user shares a task folder, Outlook on the web cannot parse the invitation attachment properly.
Recognize that Outlook on the web with Microsoft 365 Business Basic cannot open shared task folders generated from Outlook desktop.
To share task folders successfully, advise both the sender and the recipient to log in using a supported Outlook Desktop client (such as Outlook 2016 or Outlook 2019).
Navigate to the Help tab in your Outlook client and select Feedback to submit a request to Microsoft for web support regarding shared tasks.
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Frequently Asked Questions
Why do I only get an email with sharing instructions but no attachment?
When a desktop user shares an Outlook task folder with an Outlook on the web user, the web client cannot process the proprietary attachment used to link the folder, leaving you with just the plain instruction text.
Can I use Microsoft To Do to share tasks instead?
Yes, Microsoft To Do allows you to share task lists. However, both users typically must be within the same organization or using compatible Microsoft accounts, and it functions differently than classic Outlook Tasks.
Does upgrading to Microsoft 365 Business Standard fix this issue?
No, the limitation lies within the architecture of the Outlook on the web interface itself, not your specific Microsoft 365 license level. You must use the desktop application to access shared task folders.
