Microsoft claims that Samsung owes it $6.9m in damages for unpaid interest from 2013, under a deal between the two firm referred to as the Business Collaboration Agreement. The figure was revealed in unsealed court documents chronicling the ongoing legal battle.
Microsoft began suing Samsung over "breach of contract" when the Korean firm allegedly refused to pay interest after making a late royalty payment on patent licences in August.
It was originally unclear how much Microsoft felt it was owed or whether Samsung would renege on its payments again.
The court documents showed that Microsoft believes Samsung owes it $6.9m as the Korean firm delayed its agreed $1bn payment.
Samsung countered this, arguing that Microsoft's purchase of Nokia infringed on the BCA agreement, in effect making it null and void.
"Samsung breached the License Agreement last fall by refusing to make its Fiscal Year 2 royalty payment on time and then refusing to pay interest on its late payment and is threatening to breach the License Agreement again with respect to its ongoing royalty payment obligations for Fiscal Year 3 and thereafter," explained Microsoft in the court document.
"Microsoft seeks to compel Samsung to pay contractually required interest in excess of $6.9m to Microsoft for Samsung's late payment last year of over $1bn."
At the time of publishing Samsung had not responded to V3's request for comment on Microsoft's claim.
The news has led to questions about Microsoft's continued relationship with Samsung.
Samsung has increasingly moved away from Microsoft services in recent years, choosing to focus on developing Android smartphones. The firm also confirmed plans to close its PC and laptop business in September.
Microsoft corporate vice president and deputy general counsel David Howard moved to quell these concerns in a blog post.
"We are confident that our case is strong and that we will be successful. At the same time, Microsoft values and respects our long partnership with Samsung, is committed to it, and expects it to continue," he wrote.
The spat is the latest in a long line of legal battles between tech giants. From 2011 Samsung famously duked it out with Apple with a wave of back and forth patent infringement claims, before finally choosing to cease litigation in August.
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