The current Marketplace -> Microsoft -> Meetings integration needs 2 changes. 

1. The current language for the Two-Way sync option should be changed. It currently states, "Sync both your Zoho CRM Calendar and Office 365 Calendar meetings with each other."  However, what's actually being done is that a new calendar is getting created within Microsoft to sync meetings; it's not syncing the default Outlook calendar, which I believe is the assumption anyone reading this would make. 

2. There needs to be an option to sync the default Outlook calendar with Zoho CRM. This is where all meetings in Outlook reside, and is what's needed to provide a useful solution to ensure that meetings are in sync between the 2 platforms.