Manage exchange 2010 calendar from SP 2013

I would like to add a functionnality in SharePoint 2013.

We're using Exchange 2010. I would like to create some infopath forms/workflows and so on, to permit a manager for example to manage project by adding/removing/modifying elements in others' exchange calendar.

I mean : In a calendar list in SP2013, if a manager got delegation permissions on Exchange's side, then he would be able to check (and manage) employees' calendar.

The goal is to manage and check lots of users's calendar with SharePoint features at the same place. And calendars must be sync with exchange so emloyees will see their calendar on their phones for example (as it'd be synced with outlook).

I really don't know if I understable, let me know if I'm not.