Hi Suresh,
Based on your description, you want to get last logon information on some email id.
You can use the Powershell command Get-LogonStatistics and Get-MailboxStatistics to show you when a user has logged on to Office365 the last time.
Log on Remote PowerShell with your Office 365 account. For the information about Using Windows PowerShell in Exchange Online: http://help.outlook.com/en-us/140/cc546278.aspx
http://help.outlook.com/en-us/140/dd575549.aspx (All PowerShell commands available in Office 365)
Thanks,
Jason Jiang