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Note: This known issue was partially fixed in CMS 6.5.0 rev. 120427 (6.5.0 Update-4).

Applies to: All CMS releases

Reference numbers: 341909, 347176, 349492, 348382, 353224, 353144, 353160, 353146, 362578

Publishing date: March 15th, 2011

Last update date: May 8th, 2012

Description:

CMS versions that support IE9

Microsoft Internet Explorer 9 is currently supported by the following CMS releases:

• CMS 6.4.1 Update-5 (rev. 111003)
• CMS 6.5 Update-2 (rev. 111123)

Known issues:

• [Resolved in 6.5.0 Update-4] To use the Page Editor, Preview or Sitecore Debugger in IE9, you must enable Compatibility View mode in Internet Explorer. (341909, 347176, 349492, 348382)
• The Page Editor does not support the inline Content Editor when using IE9. Instead, the Content Editor will open in a pop-up window when a user clicks the "Edit" button in the ribbon or the "Edit the related item" command in the floating toolbar, just as if the WebEdit.UserPopupContentEditor setting was set to true. (357963) 
• The Rich Text Editor does not allow using HTML 5 tags when editing Rich Text fields. (362578)
• When using the Japanese client language in IE9, the font size in the Sitecore clients will be smaller than in IE8 and IE7. (353224)
• The Keyboard Map application does not show the key code when pressing a key. (353144)
• The Database Usage window partially hides the contents of the window. (353160)
• In the Properties dialog in the Content Editor, the ID of the current item is partially hidden. (353146)  

CMS versions that do not support IE9

Microsoft Internet Explorer 9 is currently not supported by the following CMS releases:

• CMS 6.4.1 Update-4 and earlier CMS releases

Most of Sitecore user interfaces are however expected to work correctly when running IE9 in Compatibility View mode.

Enabling IE9 Compatibility View mode

For more information on how to enable Compatibility View mode in Internet Explorer, refer to the following article:
http://windows.microsoft.com/en-US/internet-explorer/products/ie-9/features/compatibility-view