According to the Wall Street Journal, the alliance will probably lead to Google's web-based applications such as instant messaging and spreadsheets being integrated with Salesforce.com's web-based CRM software.
If a partnership does emerge, it will be a threat to Microsoft, which has a CRM offering as part of its range of desktop-based business software, although it is increasingly developing web-based extensions.
Salesforce.com chairman Marc Benioff declined to comment on any possible talks but said: "The enemy of the enemy is my friend. That makes Google my best friend."
Google also declined to comment, but reports say a formal announcement is coming in June.
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