There is a free plugin between Sage CRM and Outlook which I have used for the past 14 years. Additionally there is a third party solution called Accelerator that offers a deeper, more practical integration.
Option 1: Accelerator is a third party solution offering several key features including a deep integration with Sage CRM. This application supports current versions of Sage CRM and Outlook 2013 or 2016 (both 32 and 64 bit). Below is a brief overview video summarizing the Outlook portion of Accelerator. Demonstrations of Accelerator can be provided on request and you can download a brochure from this link. A user guide can be downloaded from this link.
Option 2: Sage CRM comes bundled with a plugin for MS Outlook versions 2010, 2013, 2016 and 365 and this is a free plugin. Below is a short video overview of the features that are included.