Kishor,
Calendar, Phone Calls and To Do list uses filters - by default you will see only your own items. However when you switch the filter you can see public and public-read only records of other users. You have a choice:
[list:1kpdfu1v]
[*:1kpdfu1v]my records[/*:m:1kpdfu1v]
[*:1kpdfu1v]all records[/*:m:1kpdfu1v]
[*:1kpdfu1v]drop-down list of individual employees[/*:m:1kpdfu1v]
[*:1kpdfu1v]custom filters - where you can define a group of employees[/*:m:1kpdfu1v][/list:u:1kpdfu1v]
