I'm comfortable with Apache/PHP/MySQL but don't have much experience with asp.net/IIS or indeed a Windows platform CMS.
Who should I look at first? Umbraco looks interesting.
That said, Umbraco is interesting if you need something in the .net space. My few remaining Windows servers all run PHP through IIS or Apache, so I can't really recommend anything else.
With this in mind, there's probably two chief concerns; from a publishing perspective - content - and from a technical perspective, databases.
Ideally, I'd like a system where anyone in the company (any location or technically ability) can submit content for reviewing, approving and publishing via branch managers. All internal content right now is on sharepoint, so I guess a cms that can integrate with msft applications like sharepoint, outlook, word etc would perfect. (Umbraco possibly can do this I believe, it's not possible with Joomla - for me, it's not suitable for the average person)
Adding to this, if we could connect our sql erp and ecommerce databases and tie all this up in a database cluster e.g. a tightly integrated information website with ecommerce and customer accounts capabilities.
I understand this might not be possible with an open source cms and might require a tonne of custom development. Nevertheless, I'd be intrigued if anyone can share their previous experiences.