I installed windows 10 on one of machines to see what it is like.
Initial impressions seemed positive and I maneged to get most programs working without too much fuss. But I have discovered and confirmed this with Sage Support in Newcastle that there is a bug which they are looking at which causes Act! to fail if you click on the documents tab which has documents in it (contact, company or Opportunity) or if you try and add anything.
My install was an upgrade using microsoft's advertised upgrade system from windows 7 on a 64 bit machine and have Office 2007.
Swiftpage knows of the fault and are looking to see what they can do. This is more to do with Microsoft and their "get it out there and we'll let the users identify the bugs" policy than anything that Swiftpage has done.
Sadly this has an impact on some of our products that interact with the documents tab.