Start > Run → type cmd to open the Command Prompt.
Go to C:\Progra~1\Exchsrvr\Bin,
Run the following commands in order,

eseutil /mh c:\progra~1\exchsrvr\mdbdata\priv1.edb
eseutil /p c:\progra~1\exchsrvr\mdbdata\priv1.edb
eseutil /d c:\progra~1\exchsrvr\mdbdata\priv1.edb

To repair Exchange 2003 Public Folders,
eseutil /mh c:\progra~1\exchsrvr\mdbdata\pub1.edb
eseutil /p c:\progra~1\exchsrvr\mdbdata\pub1.edb
eseutil /d c:\progra~1\exchsrvr\mdbdata\pub1.edb

However the disk must have free space equal to the size of the Exchange EDB on the same volume.
Because a temporary EDB equal to the size of the original EDB is created in C:\Progra~1\Exchsrvr\Bin; if there is no free space you must take other steps.

Run “Eseutil /?” to see how to create the temp.edb in another location.