For quick and error free migration of GroupWise emails, contacts, archives, calendar items, send items etc. to Exchange Server, I would like to suggest Kernel for Novell GroupWise to Exchange Migration tool.

Software Important Features -

* Easy-to-use and Secure
* Capable to migrate unlimited mailboxes
* Perform accurate email migration
* Support Unicode character conversion
* Support all version of GroupWise
* Compatible with all MS Exchange version

To get familiar with functionality of software, one can download its free trial version from http://www.groupwisetoexchange.net