Is the Core i7-1355U fast enough for office work?

Yes. The i7-1355U has 10 cores and boosts to 5.0GHz, which is ample for Office, browsers, video calls and light photo editing. Heavy video editing or gaming will be limited by the integrated graphics, not the CPU.

Can I upgrade the RAM and storage?

HP's 17-inch business chassis typically has accessible memory and storage slots, but confirm the exact configuration before buying. The 256GB SSD is the part most owners will want to expand first.

How does it compare with a 15-inch business laptop?

It gives you a larger screen and a numeric keypad, which help with spreadsheets and data entry. The trade-off is weight and bulk, so it is better as a desk machine than a daily commuter.

Does it have a backlit keyboard?

The listed features cover a full-size keyboard with a numeric keypad but do not mention backlighting. Check the specific configuration if you often work in dim rooms.

What ports does it include?

USB Type-C, USB Type-A, HDMI, a headphone/microphone combo jack, plus Wi-Fi 6 and Bluetooth. That covers a monitor, peripherals and wired audio without a dongle.