Microsoft is investigating customer complaints that both MSN Messenger and Hotmail have been intermittently inaccessible since Friday morning, a representative said.
Hotmail users complained to CNET News.com that the service could not be accessed several times during the day on Friday. Microsoft's instant-messaging application, MSN Messenger, also had connectivity problems.
Although Microsoft did not finger Passport as the cause of the issues, a hiccup in the affected services could be explained by problems in the company's Internet identity service, said Roopak Patel, senior analyst at Keynote.
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