|Two things.. |
- What version of Office are you using?
- And what is the size of your current .pst file? You can find out in C:\Users\you\AppData\Local\Microsoft\Outlook. (By default, the AppData folder is hidden, click Tools at the top in Windows Explorer and go down to folder options. Within that first tab in the checkbox list you'll see an option that says "Show hidden files or folders".