Office-oriented inkjets include the few single-function printers and MFPs designed for relatively heavy-duty printing, as well as any with office-centric features. Among these are standalone faxing; faxing directly from your PC's hard drive; and scanning to email and automatically adding the scan as an attachment, whether by connecting to an email server directly or using your PC's email program. That said, remember that faxing can be helpful for home use, too. Some medical offices, for example, insist on faxing, rather than emailing, medical information. Automatic document feeders (ADFs) for easy scanning, faxing, and copying multipage documents are common on office AIOs. If you need to scan duplex documents (with printing on both sides of the page), make sure the ADF can handle them. Those that scan both sides of a page on a single pass are faster, more convenient, and, unfortunately, more expensive than reversing ADFs, which scan one side, flip the page over, and then scan the other. Some, but not all, ADFs that scan one side only also let you manually flip the entire stack over and feed it back into the scanner; it then interfiles the pages for you in the correct order. Most inkjets meant for offices, including home offices, offer duplex printing. However, a few don't, so if you want to print two-sided documents, make sure the printer you pick includes an auto-duplexer. Most print on up to legal-size paper. A few support printing at up to tabloid size (11 by 17 inches) or even supertabloid size (13 by 19 inches), giving you a better chance to fit all the columns in a wide spreadsheet onto a single page. Many can also print on longer sheets of paper, at various non-standard sizes. One specialized kind of office inkjet (mentioned earlier on) is the mobile, or portable, printer, meant for business travelers who need printing wherever they go. Aside from thermal printers that use special paper, these inkjets are the only choice for mobile business printing. Mobile printers typically have low paper capacities and slow speed, and they demand a few other compromises. There aren't many models in this category, however, and they tend to cost a lot more than comparable non-mobile inkjets. That said, if hard copy on the spot is paramount, and you're looking to print documents (contracts, receipts, prospectuses, and the like) in a client's office, on a potential customer's kitchen table, or in your car just before a meeting, a battery-powered mobile inkjet will do the job.