M365 Outlook - Outlook Running Slow

Overview

Outlook may run slowly if there are many emails or large attachments.

Step 1 – Restart Outlook

Close Outlook completely and reopen it.

Step 2 – Restart Your Computer

Restarting your computer often resolves performance issues.

Step 3 – Archive Old Email

Large mailboxes can slow down Outlook.

Move older messages to archive folders.