Answer
The GFI FaxMaker Client is not compatible with 64-bit version of Microsoft Outlook. This is a limitation imposed by the fact that the MAPI component in Microsoft Outlook 2010 x64 runs in 64-bit which is not compatible with the library that GFI FaxMaker uses to access Microsoft Outlook contacts using MAPI.Due to this incompatibility, you may receive the following error: 'Either there is no default mail client or the current mail client cannot fulfill the messaging request. Please run Microsoft Outlook and set it as the default mail client.'