I started a new job in 2010 and they forced a Blackberry on me. I had a field job at the time and told them there is no way I'm taking a step backwards in technology when I'm out on the road. I want an iPhone and you either get me one or I'll use my own.
They laughed and said the iPhone is a toy in comparison, and Blackberry is the business standard. I asked, do you seriously think Apple is going to ignore the business market? Do you seriously think companies are continue to purchase expensive and buggy Blackberry servers? How an IT department can be so short sided is beyond me.
Long story short, I plugged my phone in to the charger at home and forwarded all calls to my iPhone. I told everyone, "for whatever reason text messages aren't working. If you need to get a hold of me call or send a text to my personal phone." Years later they finally caught on when somone noticed my bill had 0 minutes on it, but by then all the execs had iPhone's. 😂
One guy, I never could figure out what he was doing there, railed at me that it was MY server setup that was killing HIS Blackberry server. He was forwarding his emails to his Blackberry server, and was ranting that a small percentage of the emails are getting through, AND he couldn't read them on his computer anymore

. I tested with several messages and all went through fine. He complained about lag too. Okay, forwarding emails out of an Exchange server to a PC running server software on a residential internet line isn't going to have some issues? Okay.
He declared that 'we' should host the Blackberry server software in-house so it 'worked better'. He was using it in 'free mode (?)' and wanted their company to do the same. I refused to install or support it unless they did 'full mode', and that was hysterically expensive, and ran heavy on the server, and was notorious, from what I could determine, to drop messages and cause many issues, etc, etc...
Eventually he dropped it. I gave him some pointers on configuring his server better to support it, but thought it never actually worked right. I think he ended up just forwarding messages directly to it somehow, and even that didn't work flawlessly. *shrug* It seemed a long way around the issue of getting messages on a mobile device, to have your own 'server' and install flaky software. Weird... Sometimes the customer isn't right, they are down right nuts...