Copilot in Outlook Cannot Summarize Shared Mailbox Thread: Fix

When you try to use Copilot to summarize a long email thread in a shared mailbox, the feature may fail silently or return an error message. This problem occurs because Copilot requires direct access to the mailbox data through Microsoft Graph, and shared mailboxes often lack the necessary permissions or indexing. This article explains why … Read more

Copilot in Outlook Summary Missing for Long Email Thread: Fix

When you open a long email thread in Outlook, the Copilot summary box at the top may not appear. This leaves you scrolling through dozens of messages to find the key points. The issue usually occurs because Copilot cannot process threads that exceed its token limit or that contain unsupported content. This article explains why … Read more

Copilot in Outlook Cannot Summarize This Email Thread: Fix

You click the Copilot button in Outlook and select Summarize, but the pane shows the error Copilot cannot summarize this email thread. This usually happens when the email conversation has more than 50 messages, contains unsupported file attachments, or has a corrupted thread structure. This article explains the three root causes and gives you a … Read more

Copilot in Outlook Writes Too Formal Replies: Fix Tone Settings

When you use Copilot to draft a reply in Outlook, the generated text often sounds overly formal or stiff. This happens because the default tone setting is set to Professional, which prioritizes polite and structured language over casual or conversational flow. Many business users find that replies sound like they were written by a corporate … Read more

Copilot Automatic RSVP Not Working in Outlook: Fix

You open a meeting invitation in Outlook and expect Copilot to automatically suggest or send an RSVP response. Instead, nothing happens or you see an error message. This problem occurs because Copilot’s automatic RSVP feature relies on specific permissions, settings, and licensing that must be correctly configured. This article explains the root cause of the … Read more