Hi,
- Out of Box there is no option for this; however it is possible to pull up Usage Analysis reports past 30 days with SharePoint Designer.
- The reason it is limited to 30 days is because any query that pulls the data for a period of more than 30 days through SharePoint, can cause a performance hit as it will task the SQL Server while attempting to pull this information.
Please refer http://msdn.microsoft.com/en-us/library/ms550992.aspx MOSS SDK for the specific tables being used for this process.
Please let us know if this helps, Thanks
Warm Regards, Pratik Vyas | SharePoint Consultant | http://sharepointpratik.blogspot.com/ | Posting is provided "AS IS" with no warranties, and confers no rights