Migrating From Windows XP Is Hard, John Lewis Explains

words of Paul Miles, a project manager with John Lewis Partnership, most of these 26,000 machines were in use at the supermarkets and department stores, while some were at headquarters. Laptops and desktops, both. The company thought about buying custom support from Microsoft, but decided against it, given the prices. Miles says that no one thought it would be good value for money. And as expected, application compatibility ended up being one of the most important issues. A fair amount of software did not work on the newer version of Windows. They decided to go with compatibility solutions, where possible, and rebuilt some custom programs to make them work:

“We had 800 separate applications we were running on XP. There was a lot of activity at the beginning to see which ones will work, and which ones will not work and will never work and need to be upgraded. A lot of those, we had to completely re-write because they were our most important systems. In the end, some applications we had to keep on XP because there is no alternative. We have had to implement additional security to make sure they stay safe.”
Luckily, some 90% of their software worked fine with Windows 7, the rest they worked around. However, migrating from Windows XP directly to either Windows 8.1 (or the upcoming Windows 9) could result in more such compatibility issues with legacy software. Especially for organizations that have thousands of computers.]]>

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