When the .pst file (for archive name) has become corrupted it will not be possible for Outlook to archive to that file. Now close Outlook and use the Inbox Repair Tool. When the .pst file is full Outlook won’t be able to store more items in it.
NOTE: Archiving works based on the modified date of an item. The modified date of an item can be viewed by opening the item and then choose File > Properties. In some cases check for scanning the item by for instance a virus scanner, anti-spam filter.