We have a user who has an OST file that is 35 GB in size on a system that uses Outlook 2010. They only have 3 GB of free space left on their hard drive and we have cleared the system up as much as possible. They are now having other problems associated with a Windows 7 system on a network that is running out of hard drive space. We have run repairs on the OST, deleted the OST, tried new Mail profiles but we are having the same issue. We have created new OST files and changed the default but the other one still keeps growing. Any assistance offered helping to solve this will be appreciated.