Like it or not Windows Servers and domains make up an integral part of general business networks. Getting Macintosh and/or iPad devices to play well in those environments would likely improve their adoption rates.
Two issue I encountered in 2012 that exemplify the poor state of integration are these:
When printing from a Macintosh to a Windows domain hosted printer, the metadata associated with the print job is not fully translated between the Macintosh OS print subsystem and the Windows print subsystem. The paper may come out of the printer, but if held in queue (within the Windows system) and viewed, the document names are not passed from the Macintosh to the Windows print subsystem. In document accounting and secured printing systems like those I sell and support, that means all documents from Macintosh computers are named "Remote downlevel document" instead of the document names assigned at the Macintosh.
Second, the hoops one must jump through to print from an iPad or Mac to printers shared on a Windows OS network are rediculous in this day and age. Insisting on specific brands of "Air Print" approved devices adds new meaning to BYOD (you'll have to bring your printer too!)
While there are plenty of entrepeneurs offering solutions to this problem, it would benefit both Apple and Microsoft to put aside the spiteful indifference toward accomodating each other's technology. The price of such spite is being paid by customers of both companies to no advantage to the spiteful. Steve Jobs and Bill Gates are gone. Let's get over the past and start recognizing the real needs of the general customer base.