Secondly, meetings moved to a .PST file do not work properly. You should stop using .PST files as the primary work space for your users' email. You definitely want to get your mailbox size limits in place, along with increasing your storage capacity. .PST files should only be used to archive old messages or meetings but never as a primary work space. This is most likely causing the issues you are having..
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This was first published in March 2009