The South African case against Microsoft is likely to mirror the European Union antitrust case, according to the source.
Microsoft is not aware of any complaint filed by the South African competition authority, the company said in an emailed statement.
The Competition Commission did not immediately respond to a request for comment.
The US software giant faces a EU complaint by rivals over its cloud computing licensing practices in the region.
Industry group CISPE, which includes members such as Amazon.com and 26 small EU cloud providers, filed a complaint in late 2022 alleging Microsoft's new contractual terms were harming Europe's cloud computing ecosystem.
Microsoft amended its licensing terms in mid-2022 after rivals in Germany, Italy, Denmark and France took their grievances to the EU competition watchdog.
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