I have a 600MB pst file that gets backed up as 13 smaller segments in the backup zip file. This breaks some zip utilities as all the segments have the same filename in the zip archive. This only seems to happen to pst files and no other file type.

Hi, The pst files are Outlook files. Since it is not related to Windows 7 system, we may not be able to get more information here. I suggest you discuss in the following forum. Installing, Upgrading, and Activating Microsoft Office Products Forum Arthur Xie - MSFT