After a lot of searching I finally managed to solve this problem (which occured after I have installed xp with nlite, chosing not to install Outlook Express, and therefore a had a missing non-existent Mail system) What I have done is this: Extract the below mentioned files from the original windows xp sp2 installation cd (not the nlite-version!) to c:\program files\outlook express\i386 . You will find them in the \i386 on the windows cd (the \i386 subfolder has to be created manually) (please see below for a list of these files) extract the msoe50.inf file in the c:\program files\outlook express folder right click the msoe50.inf file and chose "install" (original windows xp sp2 installation cd should be inserted in your cd drive, because windows will search and install additional files from this cd) regsvr32 outlmime.dll regsvr32 inetcomm.dll And here, finally, the files which have to be extracted to the c:\program files\outlook express\i386 folder: msimn.exe oemig50.exe setup50.exe MSOE.HLP MSOE.CHM DIRECTDB.DLL inetcomm.dll INETRES.DLL msoe.dll msoeres.dll oeimport.dll oemiglib.dll MSOE.TXT If windows complains that it doesn't find some of the files contained in the c:\program files\outlook express\i386 folder, although they are present, please make a note of these files and copy them manually to c:\program files\outlook express and try again. If outlmime.dll or inetcomm.dll are missing on your system, please google for them and download them from the internet and copy them into your %windir\system32 directory (and execute the regsvr32 commands afterwards). If one or both of the dll-files are present on your system, but you still get an error message, (saying something like "wrong entry point in regsvr32), make sure they are in the system32 folder. If they are, and the error message persists, they might be the wrong file versions. Download a fresh (and probably older versions from the internet) and try with these "fresh" files. Greetings, nolens