Right after launching Office 365, Microsoft released Service Pack 1 for Microsoft Office 2010 which includes Office 365 support besides the usual fixes. For those interested, Office 2010 SP1 can be downloaded here (x86) and here (x64). Related knowledgebase article including list of changes is KB2460049.
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.