This specific error indicates that the proper version of Link to Outlook was not installed. To resolve the issue, please complete the steps below to uninstall and reinstall the Link to Outlook plugin.
1. Close Outlook 2. Go to Start > Control Panel > Add or Remove Programs (Programs and Features in Windows 7). 3. Uninstall GIFTS Online Link to Outlook plugin. 4. Also uninstall the following Outlook Add-In items, if present: Microsoft Office 2003/2007/2010 Primary Interop Assembly Visual Studio 20xx Tools 5. Restart your computer 6. After rebooting, open Outlook and make sure the above Add-Ins have been removed Outlook 2003: Tools > Options > Other > Advanced Options > Add-In Manager Outlook 2007: Tools > Trust Center > Add-Ins Outlook 2010: File > Options > Add-Ins 7. Close Outlook. 8. Install the plugin again