I started working in the early 90s, first in a Saturday job with a large high street retailer, then in various office jobs after I graduated.
Physical pay packets you collected from the cash office via the little window
Proper staff canteens and staff toilets that weren't shared with shoppers
Dial up modem when you needed to send emails
I remember putting forward a business case for buying a couple of word processors with memories in one place
No one had a desktop computer in my first proper job
Women not being allowed to wear trousers
Boss rejecting a male interview candidate for having long hair and telling everyone he'd done so
Internal mail - intra office mail was sent overnight via DX. You dropped the bags off at the local DX office and collected what was delivered to the locker next morning. The advantage over Royal Mail was guaranteed next day delivery by something like 7am and it was cheaper
Needing a chit signed by your manager to get anything from the stationery store in a big HQ office building
A separate smoking section of the canteen in one place, complete with extraction. Everything in there was yellow with nicotine and the union rep used to hold meetings in there
Having a dedicated typist or secretary who would type everything apart from your emails for you
Lotus Notes and Word Perfect
Needing training to do things in software programs as nothing was straightforward or intuitive
Sending text messages being novel
So much has changed - a lot of formality has gone