You have to create a profile and configure it to use that OST file as its offline folder location.Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."

Hi Pierre, You can change Outlook Data File setting following below document: http://office.microsoft.com/en-us/outlook-help/move-an-offline-outlook-data-file-ost-HA010378297.aspx Hope it helps.Rowen TechNet Community Support

Hello I have an exchange 2010 and outlook 2010. I would like to check my calendar from the last year, but there is nothing in outlook. So I would like to open my file outlook.ost, but i can 't open it ....... How can i open it ? Thank you

You have to create a profile and configure it to use that OST file as its offline folder location.Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."

Hi Pierre, You can change Outlook Data File setting following below document: http://office.microsoft.com/en-us/outlook-help/move-an-offline-outlook-data-file-ost-HA010378297.aspx Hope it helps.Rowen TechNet Community Support