Why is New Outlook Slow to Sync

| May 5, 2026

Why is New Outlook Slow to Sync

New Outlook is still new to a lot of people and while it’s fast…it can still be sluggish. Below is a list of things I look at when I help clients.

I go through most of these during the onboarding of our first appointment and can figure out the problem quickly. Then we move on to solutions. Solutions may take time to repair, or can be moved to a project (migrate email to Exchange) or repair with other options. All options are your choice. If you need help with Outlook slow to sync, feel free to use the form at the bottom of this page and contact me.

  • Bad connection to the email server
  • VPN interference
  • Antivirus or security software (Malwarebytes, Norton, etc.)
  • Too many email accounts added
  • Too many shared mailboxes
  • Poor or high-latency internet connection
  • Exchange Online throttling (Microsoft 365 limits
  • Problematic com add-ins
  • AutoDiscover configuration issues
  • DNS misconfiguration or slow DNS resolution
  • Windows Search indexing problems
  • Background apps consuming bandwidth (Teams, OneDrive, backups)
  • OneDrive sync conflicts (especially with PST files)
  • Firewall or network filtering / deep packet inspection

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Category: New Outlook

About the Author ()

Lisa Hendrickson is the owner of Call That Girl. She is an Outlook Expert and Microsoft 365 Consultant.

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