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Outlook performance is slow in the Office 365 environment

When you use Microsoft Outlook together with Microsoft Office 365, you experience one or more of the following symptoms:
  • Outlook responds slowly when you try to open email messages.
  • When you send an email message, the message sits in the Outbox folder for a long time.
  • Outlook responds slowly when you try to insert an attachment. Frequently, you receive the following warning message:
    Outlook is retrieving information from the server
This issue may occur for many reasons.

This issue may be caused by an Exchange Online server issue. In this case, sign in to the Office 365 portal by using your administrator credentials, and then click service health to determine whether other customers are experiencing the same issue. If other customers are experiencing the issue, the issue should end when the service-interrupting event is resolved.

Also, determine whether any local network issues might be causing the problem. This includes issues that affect your local proxy server, firewall, or Internet service provider.
To troubleshoot this issue, follow these steps:
  1. Make sure that the latest updates for Outlook are installed. For more information, see the following Microsoft Knowledge Base article:
    2625547 How to install the latest applicable updates for Microsoft Outlook (US English only)
    Test to learn whether the issue is resolved. If the issue persists, go to step 2. 
  2. Try the methods from the following Microsoft Knowledge Base articles, as appropriate for the version of Outlook that you're running:
    • For Outlook 2010 and later versions: 
      2652320 "Outlook not responding" error or Outlook freezes when you open a file or send mail
    • For Outlook 2010:
      2695805 How to troubleshoot performance issues in Outlook 2010
    • For Outlook 2007:
      940226 How to troubleshoot performance issues in Outlook 2007
    If the issue persists, go to step 3.
  3. Try the following:
    • Use the Microsoft Office Configuration Analyzer Tool (OffCAT) to determine whether too many mail items are located in the email account’s critical data folders. For more information, see the following Microsoft Knowledge Base article:
      2768656 Outlook performance issues when there are too many items or folders in a Cached mode .ost or .pst file folder
    • Disable Skype for Business Online (formerly Lync Online) integration. If Outlook is integrated with Skype for Business Online in your Office 365 environment, the integration may affect Outlook’s performance. To disable Skype for Business Online integration with Outlook, follow these steps:
      1. Open Lync, click the gear icon (Screen shot of the gear icon in Lync) in the upper-right corner, point to Tools, and then click Options.
      2. Click Personal, and then clear the check boxes in the Personal information manager area. 
      3. Click OK, and then restart Outlook and Lync.
Still need help? Go to the Office 365 Community website.

Article ID: 2441551 - Last Review: 12/04/2015 02:49:00 - Revision: 41.0

Microsoft Exchange Online, Outlook 2016, Microsoft Outlook 2013, Microsoft Outlook 2010, Microsoft Office Outlook 2007

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