OWA

OWA stands for

IT

 * External Access to EC emails; litelarly it is an abbreviation of the Outlook Web App, originally called Outlook Web Access and before that Exchange Web Connect (EWC), is a webmail service of Microsoft Exchange Server 5.0 and later..

Web analytics

 * Open Web Analytics, an open source web analytics software (licensed under GPL) and provides web site owners and developers with the web analytics (tagging - Javascript, PHP, or REST based APIs). OWA also comes with built-in support for tracking web sites made with popular content management frameworks such as WordPress and MediaWiki.

Other

 * Ordered Weighted Averaging used in the in computational intelligence because of their ability to model linguistically expressed aggregation instructions.
 * Open World Assumption, an assumption that the truth-value of a statement is independent of whether or not it is known by any single observer or agent to be true (formal logic). Heuristically, the open world assumption applies when we represent knowledge within a system as we discover it, and where we cannot guarantee that we have discovered or will discover complete information.