I am running Outlook 2007 and I will be migrating my PST file to an online email service I like (Zoho). I wanted to reduce the size of the file because it is 16GB large. I permanently deleted about 20% of my emails and then I ran Outlook Attachment Sniffer. OAS removed 6GB of attachments from my emails. After all this I went to take a look at my PST file and it is the same size as before?? How is that possible? How to I get the PST file to decrease in size? It should be about 10GB in size now, not 16GB.