| Emissary | Compress PST Size | Compress PST Pro | Software to Convert OST2PST | |
| 5.5 | 2.2 | 1.0 | 5.5 | |
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| Shareware | Shareware | Shareware | Shareware | Licence |
| $44.95 | $49.00 | $49.00 | $49.00 | Price |
| 0.96 MB | 2.37 MB | 2.10 MB | 24.40 MB | File size |
| Sep 19, 2005 | Nov 11, 2011 | May 9, 2016 | Mar 13, 2018 | Update |
| 16 | 15 | 19 | 42 | Downloads |
| Windows XP, Windows 2000 | Win2000, Windows 7 x32, Windows 7 x64, WinOther, WinServer, Windows Vista, Windows Vista x64, Windows XP | Win2000, Windows 7 x32, Windows 7 x 64, Win Server, Win Vista, Win Vista x64, Win XP and Win8 | Win2000, Windows 7 x32, Windows 7 x64, WinOther, WinServer, Windows Vista, Windows Vista x64, Windows XP | OS |
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