Assume that you use the Send as Attachment command in a Microsoft Office 2010 application to send a file. When you type the name of a receiver in the To field, the AutoComplete feature does not function as expected in Microsoft Outlook 2010.
Note This issue occurs when you use the Send as Attachment command in the Office 2010 application before Outlook 2010 is running.
To resolve this issue, apply the following update:
2596485 Description of the Outlook 2010 hotfix package (Outlook-x-none.msp): October 25, 2011
Registry key information
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows
After you install the hotfix package, follow these steps to enable the hotfix: