Keep your friends close and your enemies closer. Apple and IBM are known rivals, so it was a huge shock when the two companies recently announced that they would be partnering together to sell more of Apple’s iphones and ipods to corporate customers and government agencies. As two of the largest companies, there has previously been a lot of tension and competition between the two, however Apple’s Tim Cook and IBM’s Ginny Rometty say that the hard feelings have faded away as technology has evolved and the companies have moved in new directions. IBM moved on from the PC business …