TL;DR: Microsoft Office 2021 and Windows 11 Pro are discounted to $54.97 through September 3 — that’s less than $28 each. Summer’s winding down, and back-to-school season is in full swing. Whether you’re hitting the books or looking to help your student, check out this ultimate back-to-school bundle: Microsoft Office and Windows 11 Pro, armed to help you tackle assignments and fight procrastination. This office suite and OS typically costs hundreds separately, but they’re on on sale for $54.97 for one more day. This is your last chance to upgrade your Windows computer before school starts. Rel…