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Outlook PST file still same size after all attachments deleted??

Last Modified: 2015-04-11
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.
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