How to Search Outlook Group Conversations and Yammer-Linked Threads

Outlook groups and Yammer-linked threads store conversations in separate locations from your main mailbox. When you search for a message inside a group conversation or a Yammer thread, Outlook may return no results if the search scope is set to your primary mailbox only. This article explains how to configure Outlook to search across all groups and Yammer-linked conversations, and how to use the correct search syntax to locate specific posts.

Outlook uses the Groups content index to store conversations from Microsoft 365 Groups and Yammer communities. The search index does not include these items by default unless you add the Groups folder to your search scope. This guide covers the steps to expand your search to include all group conversations and Yammer-linked threads, and how to refine results using keywords and filters.

You will learn how to change the search scope in Outlook, use the Search Tools ribbon to target groups, and troubleshoot cases where Yammer threads remain hidden from search results.

Why Group Conversations and Yammer Threads Are Hard to Find

Outlook stores group conversations in a separate folder hierarchy under the Groups node in the folder pane. Each Microsoft 365 Group appears as a top-level folder with subfolders for Conversations, Files, and Calendar. Yammer-linked threads appear inside the Conversations folder of the associated Microsoft 365 Group.

The Outlook search index treats group folders as separate content stores from your primary mailbox. When you type a search term in the main search box, Outlook defaults to searching only your current folder or your mailbox. It does not automatically search across all group folders. This behavior causes group conversations and Yammer threads to be invisible in search results unless you change the search scope.

Another factor is that Yammer conversations linked to a group are not stored in Exchange Online. They are stored in Yammer’s cloud service and only a link or summary post appears in the group’s Conversations folder. Outlook indexes the summary post but not the full Yammer thread content. This limitation means you can search for the subject line or sender of a Yammer-linked post, but you cannot search for words inside the Yammer thread body.

How Outlook Indexes Group Conversations

Outlook uses the Windows Search index to build a catalog of all items in your mailbox and group folders. When you add a new group, Outlook automatically subscribes to the group and downloads its conversation history. The indexer then scans the group’s Conversations folder and adds each message to the catalog. This process can take several minutes for large groups. Yammer-linked posts are indexed only if they are synced as email messages in the group folder. Pure Yammer threads that are not synced as email are not indexed at all.

Steps to Search All Outlook Group Conversations

1. Open the group folder
   In the folder pane on the left side of Outlook, expand the Groups section. Click the name of the group whose conversations you want to search. The Conversations folder opens automatically.
2. Focus the search box
   Press Ctrl+E on your keyboard. This moves the cursor to the search box at the top of the message list and clears any previous search term.
3. Select the All Groups scope
   Click the drop-down arrow inside the search box. A menu appears with options: Current Folder, Current Mailbox, All Mailboxes, and All Groups. Select All Groups. Outlook now searches across every group folder you have subscribed to.
4. Type your search term
   Enter a keyword, sender name, or subject line. Outlook displays matching items from all group conversations. Results include both regular group email and Yammer-linked posts that have been synced as email.
5. Refine results with Search Tools
   Click the Search tab on the ribbon. In the Refine group, click Group and select a specific group name from the list. This narrows results to a single group’s conversations.

Search Yammer-Linked Threads Specifically

1. Open the Yammer-linked group folder
   In the folder pane, locate the Microsoft 365 Group that is connected to your Yammer community. The group name usually matches the Yammer community name.
2. Search by subject or sender
   Type the subject line of the Yammer thread or the name of the person who posted it. Because Outlook indexes only the summary post, you cannot search for body text from the Yammer thread itself.
3. Use the Search Tools From filter
   Click the Search tab and then click From. Enter the full name or email address of the Yammer poster. This returns all group posts from that person, including Yammer-linked threads.

If Outlook Still Has Issues After the Main Fix

Search returns no results for a specific group

The group folder may not be fully indexed. Open the group folder and wait for Outlook to sync its contents. To force a sync, right-click the group folder and select Update Folder. After the sync completes, try the search again.

Yammer threads do not appear in any search

Yammer threads that are not synced as email messages cannot be searched in Outlook. Open the Yammer web app or the Yammer mobile app to search those threads. To make future threads searchable in Outlook, configure the Yammer community to send email notifications for new posts. In Yammer, go to the community settings and enable Email notifications for all members.

Search scope keeps resetting to Current Mailbox

Outlook does not remember the search scope setting across sessions. Each time you perform a new search, you must manually select All Groups from the scope drop-down. There is no setting to make All Groups the default scope.

Search Scope Options in Outlook: Comparison

Item	Current Folder	All Groups
Default behavior	Searches only the open folder	Searches every subscribed group folder
Yammer threads indexed	Only if folder is a group Conversations folder	All synced Yammer summary posts
Performance	Fast, small index	Slower, larger index
Persistent across searches	Yes, resets to Current Folder each time	No, must reselect each search

To search group conversations and Yammer-linked threads in Outlook, always use the All Groups scope. For Yammer threads that are not synced as email, use the Yammer web app. To speed up future searches, ensure all groups are fully synced before searching.

After mastering the All Groups search scope, try using the Search Tools ribbon to filter by date, attachment, or category. These filters work inside group folders the same way they work in your mailbox. For advanced searches, use the query syntax group:”Group Name” keyword directly in the search box to bypass the scope drop-down entirely.