Rewrite ASP.NET CRM using Drupal?

Hi,

I work for a company that uses a bespoke CRM. It was built in-house and is a web based application approximately used by 100 people globally across several sites connected by WAN and VPN site-to-site connections. It's written in Microsoft .NET and ASP.net in C# with a MySQL community edition for its data repository.

Here's the thing - the team that built the system left the company and so we have been outsourcing the maintenance and ongoing development to a 3rd party but we have a website design and development team still in-house that are all Drupal trained. All of our company websites are built by this team using Drupal 7 and they have said that rewriting, rebuilding and replicating our CRM can be done using Drupal 7 without losing any functionality.

To get a bit more information or clarity, have people using these forums done something like this before whereby they could give advice/feedback on how the projects went, how easy/difficult it was to copy the system and rebuild, would you recommend the process... etc?

Obviously complexity of a CRM and size differs from place to place but as a project would it be something worth investigating? The obvious advantage is that we wouldn't have to rely on 3rd parties for ongoing maintenance as we would have the expertise here to fix and tweak our system when needed.

Any info, advice or help would be much appreciated!