how do we install outlook plug in?
You will want to completely close Outlook and then head to the download page.
https://marketplace.infusionsoft.com/listing/infusionsoft-infusionsoft-sync-for-outlook
There will be a ‘Get the App’ button on this page that will download the file. Once downloaded, just open and install the file. After the installation is complete, you should be able to open up Outlook again, and the Outlook Sync sidebar / features should be available.
If you run into any issues during installing, I would recommend reaching out to our live support team @ 1-866-800-0004 Ext 2. 
Thank you!
Hi @James_Mefford, and how about those who have Outlook app using via iMac? It’s my case btw. Thanks in advance.