Here’s something I found out a few weeks ago, just before I went on holiday: installing SP1 for SSAS 2008R2 breaks a PowerPivot installation on the same machine. After I’d installed SP1 on my laptop I found I got an “Unable to open file” error message in PowerPivot whenever I tried to import data, at which point PowerPivot crashed. For me the fix was easy – reinstall PowerPivot and it worked again – but I’m glad I found this out before I needed to use PowerPivot in front of a customer.

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