GroupWise 2014 R2 Support Pack 2
Sending a document from Excel can crash GroupWise when the current working drive is mapped to a UNC path. This can occur in environments such as VMWare AppStack when excel is launched from a network drive that does not have an existing drive mapping. It also happens when Excel is launched directly from a non-mapped UNC path from within Windows Explorer.
This has been reported to engineering and fixed in build 135088 or higher of GW 18.1.1 client. Contact support to get build or wait until 18.2.0 release.
The crash was caused by a call to _getDrive that was unexpectedly returning 0.