Without any data modification along the migration procedure, the WholeClear OST to TGZ converter converts the OST files into the TGZ format. The program can convert some of the OST files and folders from the OST format to the Zimbra format just instead of migrating all of the OST files. This tool provides exact migration of the OST files. Any user can simply manage the graphical user interface without considering his or her level of technological knowledge. This program preserves every metaproquality of the OST file during file migration. This application supports all Outlook versions: Outlook 2021, 2019, 2016, 2013, 2010, 2007, 2003, and various earlier versions. For the completion of the file conversion procedure, Outlook and Zimbra are not necessarily installed. This application can be installable on all the Windows versions like Windows 11, 10, 8.1, 8, Vista, and XP. It offers fault-free converting results and is virus-free. This program protects all during the transfer procedure the contacts, notes, calendars, tasks, etc. The app supports all the versions of the Zimbra desktop. One can finish the OST file conversion to the TGZ without altering the data of any OST file. Data loss problems arise neither during file conversion. The integrity of the OST files is maintained through the migration process. This application also offers a free trial edition to let one evaluate the features and capabilities prior to obtaining the licensed edition. This application offers the users 24/7 technical help for their questions while they run the program.