If you manage another person’s calendar in Classic Outlook and need to understand how delegate access changes when you or the manager moves to the new Outlook for Windows, this article explains the behavior. Microsoft is gradually replacing Classic Outlook with the new Outlook, and delegate permissions work differently across the two versions. This article covers how delegate calendar access functions when one user is on new Outlook and the other remains on Classic Outlook, what permissions carry over, and what breaks.
Key Takeaways: Delegate Calendar Access in Mixed Outlook Environments
- File > Account Settings > Delegate Access: In Classic Outlook, delegate permissions are set per mailbox. New Outlook uses a different permission model based on Microsoft 365 group settings.
- Calendar Permissions vs Delegate Permissions: Classic Outlook distinguishes between delegate access (send on behalf, meeting requests) and folder permissions. New Outlook merges these into a single calendar sharing model.
- Mixed Environment Behavior: When a manager uses Classic Outlook and a delegate uses new Outlook, the delegate can see the manager’s calendar but cannot send meeting requests on behalf of the manager.
Delegate Access Model Differences Between Classic Outlook and New Outlook
Delegate access in Classic Outlook is a feature that allows one user to manage another user’s mailbox, including sending emails on behalf of the manager, responding to meeting requests, and editing the manager’s calendar. Classic Outlook stores delegate permissions in the manager’s mailbox using Exchange Web Services. The manager assigns specific permission levels: Reviewer, Author, or Editor for the calendar, and additional options for sending on behalf.
New Outlook for Windows does not use the traditional delegate access system. Instead, it relies on Microsoft 365 group-based sharing and calendar permissions. When a user switches to new Outlook, the classic delegate permissions are still present on the server, but new Outlook does not expose the same delegate management interface. The new Outlook calendar sharing model allows the manager to share their calendar with specific users and assign permission levels: Can view when I’m busy, Can view titles and locations, or Can view all details. However, new Outlook does not support the ability for a delegate to send meeting requests on behalf of the manager or respond to meeting requests automatically.
What Happens to Existing Delegate Permissions
If a manager has set up delegate access in Classic Outlook and then switches to new Outlook, the existing delegate permissions remain active on the server. The delegate who uses Classic Outlook can still access the manager’s calendar with the same permissions. However, the manager can no longer modify delegate permissions from new Outlook. To change delegate permissions, the manager must switch back to Classic Outlook or use Outlook on the web, which still supports the classic delegate management interface.
Delegate Access When One User Is on New Outlook
The most common scenario is a manager using Classic Outlook and a delegate using new Outlook. In this case, the delegate can view the manager’s calendar if the manager has shared it with the delegate using calendar permissions. However, the delegate cannot perform delegate-specific actions such as creating meeting requests on behalf of the manager or responding to meeting requests. The delegate also cannot send emails on behalf of the manager. The new Outlook delegate experience is limited to viewing calendar details only.
How to Set Up Delegate Calendar Access for Mixed Users
To allow a delegate using new Outlook to view a manager’s calendar, the manager must share the calendar using the new Outlook or Outlook on the web sharing method. The classic delegate access setup does not automatically grant calendar visibility in new Outlook. Follow these steps to share a calendar from the manager’s account.
- Open Calendar Permissions in Classic Outlook
In Classic Outlook, go to File > Account Settings > Delegate Access. Click Add to select the delegate and assign permission level. Even if the delegate is on new Outlook, this step ensures the server-side permissions are set. - Share the Calendar via New Outlook or Outlook on the Web
Open the manager’s calendar in Outlook on the web. Right-click the calendar and select Sharing and permissions. Add the delegate’s email address and choose Can view all details. This step is required for the delegate to see the calendar in new Outlook. - Delegate Opens the Shared Calendar in New Outlook
In new Outlook, the delegate goes to Calendar, right-click Other calendars, and selects Add calendar > From directory. The delegate searches for the manager’s name and adds the calendar. The calendar appears with the permissions set by the manager. - Test Meeting Request Capabilities
The delegate attempts to create a new meeting on the manager’s calendar. If the delegate is using new Outlook, the meeting request will be sent from the delegate’s own mailbox, not on behalf of the manager. The delegate cannot send on behalf of the manager in new Outlook.
Limitations and Workarounds for Delegate Actions in New Outlook
New Outlook does not support the following delegate actions that are available in Classic Outlook. Understanding these limitations helps managers decide whether to keep Classic Outlook or switch to new Outlook.
Delegate Cannot Send Meeting Requests on Behalf of Manager
In Classic Outlook, a delegate with Editor permissions can create meetings on the manager’s calendar and send them on behalf of the manager. The recipient sees the manager as the organizer. In new Outlook, the delegate creates the meeting from their own calendar and must manually invite the manager. The manager then appears as an attendee, not the organizer. Workaround: The delegate creates the meeting in Classic Outlook or Outlook on the web, which still support sending on behalf.
Delegate Cannot Respond to Meeting Requests Automatically
Classic Outlook allows delegates to respond to meeting requests on behalf of the manager, and the delegate can choose to send a response automatically. New Outlook does not offer this option. The delegate must forward the meeting request to the manager, who then responds manually. Workaround: The manager can set up a rule in Outlook on the web to forward meeting requests to the delegate, but the delegate still cannot respond on behalf of the manager.
Delegate Cannot Send Emails on Behalf of Manager
Classic Outlook delegates with the Send on Behalf permission can compose emails from the manager’s mailbox. New Outlook does not support this feature. The delegate must use Outlook on the web or Classic Outlook to send on behalf. Workaround: The manager can grant the delegate full access to the mailbox in Exchange Admin Center, which allows the delegate to send as the manager, but this is a different permission level with broader access.
Classic Outlook vs New Outlook Delegate Features
| Feature | Classic Outlook | New Outlook |
|---|---|---|
| View manager’s calendar | Yes | Yes, with calendar sharing |
| Send meeting requests on behalf | Yes | No |
| Respond to meeting requests automatically | Yes | No |
| Send emails on behalf | Yes | No |
| Modify delegate permissions | Yes | No, use Outlook on the web |
| Create calendar items in manager’s calendar | Yes, with Editor permissions | Yes, but sent from delegate’s mailbox |
If Delegates Cannot See the Manager’s Calendar in New Outlook
If a delegate using new Outlook cannot see the manager’s calendar after the manager has shared it, check these common causes.
Manager Shared the Calendar with Wrong Permission Level
The delegate must be granted at least Can view all details permission to see the calendar in new Outlook. The default sharing option Can view when I’m busy does not show event details. The manager should go to Outlook on the web, right-click the calendar, select Sharing and permissions, and change the permission to Can view all details.
Delegate Added the Calendar Incorrectly
In new Outlook, the delegate must add the calendar from the directory, not by importing an ICS file. The delegate goes to Calendar, right-click Other calendars, selects Add calendar > From directory, and types the manager’s name. If the delegate uses the Add from internet option, the calendar will not sync properly.
Exchange Cached Mode Settings Interfere
If the delegate uses Classic Outlook in cached mode, the calendar sharing may not update immediately. The delegate can press F9 to force a send and receive cycle. In new Outlook, cached mode is enabled by default, but the calendar should update within a few minutes. If not, the delegate can restart Outlook.
Delegate calendar access between Classic Outlook and new Outlook requires careful permission management. The key difference is that new Outlook does not support sending on behalf or automatic meeting response. Managers who rely on delegate features should keep Classic Outlook or use Outlook on the web for delegate management. To test delegate functionality before switching, use the steps above to share the calendar and verify which actions work in new Outlook.