Get Microsoft Exchange to interoperate with other mail clients like Mozilla Thunderbird. The biggest challenge I find working on the Microsoft Development/Enter

Get Microsoft Exchange to interoperate with other mail clients like Mozilla Thunderbird. The biggest challenge I find working on the Microsoft Development/Enterprise stack is vendor lock-in. Of course, that is where they make their money but it's also what I find most challenging. It's easier to start-off on an open stack and pivot into something else than with MS - so now I avoid MS and other enterprise solutions unless it is overwhelmingly necessary.