Microsoft, whose software for text documents, spreadsheets, and e-mail has become a fixture in American offices, is introducing new cybersecurity tools for political candidates and campaigns that rely on the apps after seizing more Internet accounts created by Russian government hackers.

The new measures from the Redmond, Wash.-based company include notification of attacks across organizational and personal e-mail systems, security training and previews of the latest protective measures through its AccountGuard initiative, available at no extra cost to political organizations using its subscription-based Office 365.