Copilot Chat History can fill up quickly when you summarize emails in Outlook, often without realizing why it’s happening. Copilot remembers past conversations and retains up to 18 months of interactions. As a result, every email summary you create in Outlook may be saved as a separate chat entry. This makes it important to be intentional about which summaries you want to keep, and which ones are only needed momentarily.
Why Copilot Chat History Fills Up When You Summarize Emails
Explore the Inefficiencies
Summarizing Outlook emails with Copilot is highly productive. Users save significant time managing their inboxes. That’s the good part.
The problem is what happens after, if you are unaware.
Each time you click Summarize this email, Copilot stores that interaction in Copilot Chat History. When you summarize several emails in a row, your chat list fills with entries that look nearly identical. These entries also lack visual timestamps. To identify which summary belongs to which email, you must open them one by one.
Don’t feel bad if this caught you off guard. We are all learning this application together. That is exactly why this post exists.
How Copilot Chat History Stores Email Summaries in New Outlook
Experiment with Resources
This behavior is specific to Copilot Chat, not Copilot Premium.
When using Copilot Chat in Outlook:
- Each email summary is saved as a full chat interaction
- Summaries are based only on what is visible on the screen
- Chat titles often appear the same
- You must open each chat to identify the original email
This behavior is expected. However, without the right workflow, Copilot Chat History can become cluttered quickly.
How to Use Temporary Chat to Control Copilot Chat History
Execute with Confidence
Instead of starting every summary in a regular chat session, use Temporary Chat for one-off email summaries.
This keeps Copilot Chat History available for meaningful conversations instead of quick inbox decisions.
Check out this video.
How To: Summarize Emails Without Saving Them to Chat History
- Open both an Outlook email and the Copilot Chat pane
- Select More options (the three dots) in the top-right corner
- Choose Temporary Chat
- From the opened email, click the Summarize icon
When Temporary Chat is active, Copilot clearly indicates that the session is temporary. Any summaries created during that session are not saved to Copilot Chat History.
Best Practices for Managing Copilot Chat History Long Term
Effectively Recap the Benefits
To keep Copilot working for you instead of creating cleanup work later:
- Use regular Copilot Chat for conversations you want to keep
- Use Temporary Chat for quick email summaries
- Choose the appropriate chat mode before summarizing emails
This small habit shift makes Copilot easier to manage and more useful over time.
Now, go and work your magic. 🪄
More Resources
If you want a better understanding how to delete other Copilot components like pages, notebooks, or all conversations, see this blog post:
How to Delete Copilot Chat History (What Gets Removed and What Doesn’t)
