Outlook 2010 can be installed without needing to upgrade all the other Office applications. However, not all features will be available. Here are the most important features that will be missing in Outlook:

  • Attachment previewers
    Attachment previewers for other Office applications will only work when the other Office applications are the 2010 versions as well. The previewers of the 2007 versions of Word, Excel and PowerPoint are not compatible with Outlook 2010.
  • Autoformat
  • Autotext
  • Grammar checker
  • Table formatting

To view the full list of features which are not available in a standalone installation of Outlook 2010, refer to the following Microsoft and Outlook articles:

Using Outlook 2010 with or without Word 2010 installed
Upgrading to Outlook 2010