One of the key aspects when an organization is expecting to move from an OnPremises scenario to a Cloud one such as Office 365 is to have a clear understanding of all the requirements needed in this movement so the transition to the Cloud is done in the best way for the entire organization. Office 365 doesn’t impose too many requirements since we are talking about a Cloud platform. However, there are some minimum prerequisites in terms of client software that every organization moving to Office 365 should take into account as explained in the following URLs:
Basically, if we think in the Windows stack, Office 365 does not impose a specific version of client operating system as long as we use an operating system supported by Microsoft:
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Windows XP is not a supported operating system since the April 8th , 2014.
However, if you review to all the client software you could require to do an effective use of Office 365 platform, you will deduce that Office 365 is imposing a minimum version for the Windows operating system:
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IE 8 and 9 versions are partially supported by Office 365.
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OneDrive for Business sync client is not supported in Windows XP:
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Office 365 desktop suite is not supported in Windows XP (the same applies to SharePoint Designer 2013):