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You cannot see features in Office 2010 builds if you are running Communicator 2007 R2 RTM or earlier versions
Article ID: 968629 - View products that this article applies to.
If you are running Microsoft Office Communicator 2007 R2 RTM or any earlier versions of Communicator 2007, you do not see the following new features in Office 2010 builds:
To resolve this issue, install the hotfix package that is described in the following Microsoft Knowledge Base article:
For more information, click the following article number to view the article in the Microsoft Knowledge Base:
976135Office 2010 uses Communicator APIs that requires these features from Communicator, and they are available only as part of this hotfix. After you install this hotfix, the features that are discussed in the "Symptoms" section are available.
(http://support.microsoft.com/kb/976135/ )Description of the Communicator 2007 R2 hotfix rollup package: January 2010
Office Communicator 2007 R2 CU4 supports interop with the x64 edition of Office Outlook by using Exchange Web Service (EWS) in an Exchange and an Office Communications Server integration environment. By default, Office Communicator uses EWS to download notifications every 15 minutes. These notifications previously relied on MAPI. This enables the following features:
Note All other Integration features work exactly like they work with the x86 edition of Office outlook.