If you getting the below error when trying open an excel from a sharepoint library, the the issue might be because you don have the Sharepoint OpenDocument class as you add-on. These can be caused by either you are using 64bit version of the IE or the add-on is not there.
Solution – just use 32bit version of IE or repair your outlook. If your share point is running on version 2010, it is better to install a Microsoft Office 2010 for better experience. 😉
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