You can use Shoviv GroupWise to Outlook Converter tool for converting to Outlook. The best part of this tool is its GUI which links with the users effectively and, therefore, succeeds in producing desirable PST. You can utilize its demo version to analyze it well and to see whether it standouts at your expectations. Moreover, a few of its features are:
• Users can connect to their GroupWise account through four modes: Default, Online, Cache Mailbox, and Remote Mailbox Path.
• This tool provides PST split option based on the size provided by the users to avoid undesirable PST corruption.