Right after launching Office 365, Microsoft released Service Pack 1 for Microsoft Office 2010 (KB2460049) which includes Office 365 support besides a big list of fixes. For those interested, Office 2010 SP1 can be downloaded here (x86) and here (x64). For a full list of changes, check out Microsoft Office 2010 Service Pack 1 Changes Excel sheet.
More interesting for Exchange folks is that there’s also an SP1 for the Microsoft Office Filter Pack 2010, which of course you install during Exchange setup as one of the prerequisites. As you probably know, the Filter Pack is used to index Office documents stored in Exchange databases to speed up queries.
You can download Service Pack 1 for Microsoft Office Filter Pack 2010 x64 Edition here. The related knowledgebase article is KB2460041.
EighTwOne (821) 
Just fyi,
I have tried to install and it appears not valid to be installed as pre-requistes for exchange 2010
It only apply to
Supported Operating Systems: Windows 7, Windows Server 2003, Windows Vista, Windows XP
Microsoft Office Home and Business 2010
Microsoft Office Home and Student 2010
Microsoft Office Professional 2010
Microsoft Office Professional Plus 2010
Microsoft Office Standard 2010
Microsoft Office Starter 2010
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Is it recommended to install Service Pack 1 for Microsoft Office Filter Pack 2010 x64 Edition on Exchange 2010 SP1 RU2 servers? I just released it from WSUS and it installed to my Exchange 2010 SP1 server without problem so far.
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The Filter Pack contains filters to index Office documents.Since the SP might contain (security) fixes or improvements to index those document types, I’d install it unless there’s reason not to.
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