Can Texis search e-mail or discussion groups?

Yes. Texis is an excellent platform for this. Utilities for importing email as well as usenet (NNTP) data are available from Thunderstone. In the USA, this type of application may be especially important for compliance with laws mandating that significant business data be saved and kept available for auditing. Indexing email archives can also be an important management role. Texis goes far beyond most email archiving solutions that only allow one to search by header such as the From, To and Date fields. Texis will index the full text of both messages and attachments. It will allow sophisticated queries such as a phrase in attachment, between two dates, with results grouped by author.