IFilters for Exchange Server 2007 and some other products..
This download will install and register IFilters with the Windows Indexing Service. These IFilters are used by Microsoft Search products to index the contents of specific document formats. This Filter Pack includes IFilters for the following formats: .docx, .docm, .pptx, .pptm, .xlsx, .xlsm, .xlsb, .zip, .one, .vdx, .vsd, .vss, .vst, .vdx, .vsx, and .vtx.
Because Windows Desktop Search (WDS) consumes IFilters from Windows Indexing Service, the IFilters will be automatically registered and available for use by WDS.
Here is how to register IFilters with Exchange Server 2007: http://support.microsoft.com/default.aspx?scid=kb;en-us;944516
Here is the IFilter downloads: http://www.microsoft.com/downloads/details.aspx?familyid=60c92a37-719c-4077-b5c6-cac34f4227cc&displaylang=en&tm