Microsoft has seeded Windows 7 and Windows 8.1 PCs with an as-yet-optional update that will pitch the free Windows 10 upgrade to customers.

According to Myce.com, a March 27 non-security update aimed at Windows 7 Service Pack 1 (SP1) and Windows 8.1 Update — the latter, the April 2014 refresh — lays the foundation for a Windows 10 marketing and upgrade campaign. The update, identified by Microsoft as KB3035583, has been offered as an optional update, meaning that users must explicitly enable it by checking a box.

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