http://blogs.office.com/b/microsoft-outlook/archive/2009/10/29/outlook-pst-file-format-and-interoperability.aspxThis week, the Outlook product team hosted a .pst file format interoperability event here on the Microsoft campus in Redmond. As we announced on the Interoperability @ Microsoft blog , our team plans to release a specification of the .pst file formaten-USTelligent Community 1.5.134.15456 (Build: 5.5.134.15456)http://blogs.office.com/b/microsoft-outlook/archive/2009/10/29/outlook-pst-file-format-and-interoperability.aspx#19969Mon, 23 Nov 2009 18:28:43 GMT53587256-c606-4c9b-bad4-97c86b12ce62:19969francis thompson<p>How can you compare two pst files that overlap in time. Each .pst file has over 10,000 e-mails. Is there no way to merge them and keep duplicate files from showing up? If you use outlook, and just copy one into the other, then the pst is larger than 2Gig. But if the duplicate e-mails were eliminated then the file would be less than 2gig. Anyone know how to do this other than one by one looking at each file?</p> <div style="clear:both;"></div><img src="http://blogs.office.com/aggbug.aspx?PostID=19969" width="1" height="1">http://blogs.office.com/b/microsoft-outlook/archive/2009/10/29/outlook-pst-file-format-and-interoperability.aspx#19970Fri, 20 Nov 2009 00:19:45 GMT53587256-c606-4c9b-bad4-97c86b12ce62:19970tammy<p>Can anyone help me recover 7GB .pst files? please email me amt0001@aol.com THANK YOU!!!</p> <div style="clear:both;"></div><img src="http://blogs.office.com/aggbug.aspx?PostID=19970" width="1" height="1">http://blogs.office.com/b/microsoft-outlook/archive/2009/10/29/outlook-pst-file-format-and-interoperability.aspx#19971Thu, 19 Nov 2009 23:13:40 GMT53587256-c606-4c9b-bad4-97c86b12ce62:19971Janet<p>Does the PST (or MSG) file format change from Outlook 2007 to Outlook 2010?</p> <div style="clear:both;"></div><img src="http://blogs.office.com/aggbug.aspx?PostID=19971" width="1" height="1">