Both H-P and Rackspace offer cloud infrastructure (IaaS) services based on the OpenStack platform; Rackspace is an early leader within the market. H-P also offers cloud app platform (PaaS) services with the help of a partnership with Cloud Foundry (a part of EMC/VMware's Pivotal spinoff). Each company faces intense competition from Amazon, Google, and Microsoft.
Meanwhile, re/code states multiple sources have "categorically denied" a TechCrunch report stating H-P made a $43/share bid for Rackspace. As it is, dealReporter had expressed skepticism about the reliability of a source providing similar info.