Office-Outlook: Microsoft Outlook add-ins, addons and plugins, Essential Microsoft Outlook news Office-Addins: Plenty of Outlook express and Excel plugins. AbleBits: Another useful site for Excel addins, Outlook plugins, Word add-ins, Development components. MAPILab: Plugins for Excel, Outlook express and Microsoft Exchange Server. PPTools: Add ons and plugins for Microsoft Powerpoint. NOTE:These are third party websites and in no way related to Microsoft Corp.