My current company is being absorbed into a much larger company right now, got bought out earlier this year.
I was the only IT for the smaller company, and I was using 100% Linux (Debian with KDE Plasma) on my laptop to administrate everything in our environment, which is mostly Windows.
- Our DC with AD on it, I used Remmina to RDP into it for admin tasks.
- O365 and Azure/Entra stuff was all in the browser.
- Our ERP system is cloud-based, so browser was fine for that too.
- Our access control system was cloud-based and the RFID card reader/writer was plug-n-play on Linux.
- Our company SMB share worked fine with Linux in Plasma using my AD credentials.
- I set up my company OneDrive sync using rclone, it also worked flawlessly.
- Our Fortigate firewall VPN has a native Linux app which, although ugly as sin, works without issue.
- I used OnlyOffice for a while, then switched back to LibreOffice. Both worked basically perfect, a few very minor font bugs, (bullet lists having a slightly different style for the bullets, etc.)
- Teams, I used a wrapper flatpak for a while, which worked fine, then switched to the browser version of Teams. No major issues, I had a bunch of meetings, screen shares, webcam, presentations all on Teams in Linux, pretty seamless.
- Email, Outlook in the browser is fine. I also used Thunderbird for a bit, but didn't like how buggy it was in the Flatpak version, and the Debian package was way too out of date for my taste.
Now that we got bought out, I am being forced off my Linux laptop and onto the new company's Windows laptop, which really sucks. I am planning on quitting soon, as I hate using Windows and I am very underpaid at my current job as it is. Only real perk was not having to report to any IT manager/CTO, and being able to use Linux.