In fact you can load apps from more than one Apple ID onto an iOS device. From Settings > iTunes & App Store sign out of the current account, then sign in with another. I suspect the limit of protected content from up to five different accounts still applies. Managing updates from multiple accounts is a drag as you have to sign in and out of each account in turn. Another complication is that iTunes normally wants to use a single library to manage the device, so if it has been set up at work you may have fun & games getting other content onto it while keeping what is already there. I suspect you'll have to purchase or download apps directly to the device rather than syncing it with your library, but then I'm not practiced in the way apps are distributed in a corporate environment.
You should also be able to set up multiple mail, contacts & calendar accounts.
tt2