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If I run SP 2010 UI in MOSS 2007 compatibility mode by using UIVersion=3 do I still get all of the SP 2010 functionality eg enterprises wide taxonomy and metadata and FAST for SP 2010 and document and records management functionality ?

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IE6 is not supported as an authoring browser in SP2010.

Read more on the support levels for browsers on TechNet

Just saw Randy Drisgill did a nice post on this subject as well:

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Hi Anders Totally agree if you are using the SP 2010 UI (UIVersion=4) but as the UI is still MOSS 2007 UIVersion=3) and looks and feels like MOSS 2007 why should IE6 not be supported ? Regards Nigel – Anonymous Feb 15 '10 at 18:42
While I'm not 100% sure, i think the version only changes the general navigation and editing like the ribbon, while the HTML editor for example is the same across versions (i will check this when i get access to a box tomorrow). Hence support for level 3 browsers should not be expected. – Anders Rask Feb 15 '10 at 21:52

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