Be careful with the + and - before each of the options.
To turn on server side includes, use
Options +Includes
This will leave all other options as they were.
Once we came across a .htaccessconfiguration which contained
Options Includes
This turned off all other options, including SymLinksIfOwnerMatch, which began causing forbidden
403 errors on our server.
Forbidden
You don't have permission to access ... on this server.