Integrating SharePoint to Salesforce
Salesforce and SharePoint integration can be done using the below two components. File Connect, Lightning Connect
How to establish a connection between SharePoint and Salesforce
In Salesforce, Go to Setup-> Security Controls ->Auth. Providers. Click New
Authenticate the User in Salesforce to access SharePoint files
The user must be authenticated to schedule the apex class and also to view the SharePoint files under the tab chatter.