Outlook 2010 performance issues in Cached Mode on Citrix Virtual Desktop

Applies to: Microsoft Outlook 2010


Microsoft Outlook 2010 appears to run slowly in a Citrix Virtual Desktop environment, with degraded performance in, but not limited to the following:
  • searches
  • mailflow
  • other actions involving client to server requests


This behavior can occur if Microsoft Outlook 2010 is using a Cached Mode profile in a Citrix Virtual Desktop environment. A Cached Mode profile is in use if the Outlook 2010 status bar displays Connected to Microsoft Exchange, as shown in the following figure:


Configure Microsoft Outlook 2010 to use an Online Mode profile instead of Cached Mode, using the following steps.
  1. Launch Control Panel.

    In Windows 8 and Windows 8.1

    Swipe in from the right to open the charms, tap or click Search , and then type control panel in the search box. Or, type control panel at the Start screen, and then tap or click Control Panel in the search results.

    In Windows Vista and Windows 7

    Click Start , type Control Panel in the Start Search box, and then press Enter.
  2. In Control Panel, locate and double-click Mail.
  3. Click Show Profiles , and click Add.
  4. Enter a profile name, and click OK.
  5. Configure your Exchange email settings as needed, and click Next.
  6. Check the Manually configure server settings checkbox, and click Next.
  7. Uncheck the Use Cached Exchange Mode checkbox and click Finish.
  8. In the Mail Control Panel, select either Prompt for a profile to be used, or select Always use this profile and select the new profile from the dropdown.
  9. Click OK , and launch Outlook using the new profile.

    You can confirm that Outlook is using an Online Mode profile if the Outlook status bar displays Online with Microsoft Exchange as shown in the figure below.

More Information

More information on this issue can be found in the following Citrix Support article:

CTX135084 Outlook 2010 Runs Slow in Citrix Virtual Desktop Infrastructure