As I've stated earlier, PST files have a 2GB (gigabyte) limit. If your file reaches this limit you will lose data. Microsoft has steps to recover from this type of situation, but it is ugly and begins with chopping off the end of the file to make it small enough for the repair utility to recognize. There is no way to specify what data is kept or lost during this process.

• Open Microsoft Outlook.
• Right click the data file (Archive Folders in this example) and choose Properties.
  
• Click the Folder Size button. The file size will be calculated.
  
• Make sure the file is not too large. Outlook can not handle files larger than 2GB (gigabytes). If your file is approaching this size, create a new file for archiving.