WholeClear OST to TGZ Converter is a completely secure freeware that converts all OST files to TGZ format quickly. It is compatible with all Windows OS and Outlook versions. It quickly converts all OST mailboxes to TGZ Zimbra files. It is an independent software for easily converting Outlook OST files to TGZ format. With its simple interface, both novices and pros can utilize it without difficulty. It offers a free demo edition to all users so they can try it.