How can i access Office 365 account ?

Question

Hi ,

 

 I have a Windows form .

 

This form having 4 button and each button having some links that redirect to office 365 account .

 

1:Button Name: Email(its redirect to Office 365 Outlook) 

2:Button Name: Calender (its  redirect to Office 365 Calender)

3:Button Name: Team site(its redirect to Office 365 site or site collection )

 

After debugging the application  Office 365 Login page will open and after login my account its should be redirect to Office 365 Admin page .

 

Issues: when i click on Calender then its again asking for User id and password .

2nd time if i click on Mail also  again same problem , asking for Uid and Pwd .

 

please tell me the solution how  it should be resolved .

 

once application has been loged in  never asking again for please type Uid and Pwd . its should redirect directly to Calender and mail and Site collection ,