Personal folders (. Pst) files and offline storage (. Ost) files are in Unicode format with a total size of. Pst and. Ost files are preconfigured to 50GB.

You can see more information at the following website.

Office 20 10

/kb/982577

Please forgive me if I misunderstood your question.

However, if it is for personal use, it is better to control the file, and it is better to slim down the pst file when it reaches 4G-8G.

Method 1: Take out data such as mail.

Method 2: Open more pst files.