You can get that details from IIS logs, if you are using windows authentication. Use log parser tool to generate report into csv file and from that you can get the details.

Hi, How to get the count of SharePoint users logged in a day across multiple site collections? Thanks, Skancharla

There is no OOB way of doing this. Following are some workarounds you could try http://social.msdn.microsoft.com/Forums/en-US/sharepointdevelopment/thread/6833b499-78af-4dc8-9561-3d908415d9b5/ http://blog.furuknap.net/find-number-of-users-currently-logged-on-to-a-sharepoint-site Hope this helps!!!My SharePoint Blog http://dhireny.blogspot.com