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To disable the OWA 2007 Out-Of-Office warning, you will need to edit one of your server-side OWA .js files. Locate the file named uglobal.js . At the time of writing, it is in Program Files\Microsoft\Exchange Server\ClientAccess\Owa\8.1.393.1\scripts\premium although that numbered folder name will change with future service packs (look for the highest numbered folder name). Make a copy of the file (in case something goes wrong), and then open it in Notepad. Search for the text function wrnOof(). You should find a line that begins like this:

function wrnOof(){var oDlg=new BtnDlg("oofDlg",L_OofOn,L_Oof,new Array(L_Yes,L_No)

function wrnOof(){}//var oDlg=new BtnDlg("oofDlg",L_OofOn,L_Oof,new Array(L_Yes,L_No)

You have effectively changed it to an empty function, and commented out the original code. Now the OOF warning should not appear at logon.

Note - your clients will need to clear their Temporary Internet Files before this will work because the original .js file is usually cached client-side.