Yes. The OpenSpan.Office.MicrosoftOutlookMail item has a property named "Attachments". This is a collection of OpenSpan.Office.MicrosoftOutlookAttachment objects. This object has a property named "Size". This is the size in bytes of the attachment. Once you have saved it to disk, you can also get the size by writing a script using the FileInfo class to get the length (which is the size in bytes). Here is a screenshot of the latter method.