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Determine the Personal Folders file (.pst) format
- On the Tools menu, click Options.
- Click Mail Setup, and then click Data Files.
- Click the data file you want to check, and then click Settings.
- Check the Format field to see if it contains the string Personal Folders file or Personal Folders file (97-2002). Personal Folders file indicates the new format that supports multilingual Unicode data and offers greater storage capacity for items and folders. A file with the Personal Folders file type is not compatible with earlier versions of Microsoft Outlook. Personal Folders file (97-2002) indicates the earlier format that is compatible with earlier versions of Outlook. Personal Folders file (97-2002) does not support Unicode and offers the same storage capacity for items and folders that was available in earlier versions of Outlook.