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Yahoo! blasts Microsoft over WinPho 7 bug blame

Mail app's mail retrieval method non-standard, apparently...

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Yahoo! has hit back at Microsoft, claiming it is the software giant's Windows Phone Mail app that is the root of the WinPho 7 phantom data bug – and not its email servers.

The glitch, which has led some WinPho 7 phone users complain that their handsets transfer far more data – potentially with tariff-twisting consequences – than they should, is "specific to how Microsoft chose to implement IMAP for Yahoo! Mail and does not impact Yahoo! Mail on ... other mobile devices", Yahoo! told Reg Hardware.

Microsoft's methodology for interacting with Yahoo! Mail's IMAP servers was non-standard, it said.

The portal giant claimed iPhone, Android, Nokia and BlackBerry users tapping into Yahoo! Mail through the IMAP email access system were experiencing no such problems.

Yesterday, Microsoft said the issue centred on Yahoo! Mail and its Windows Phone Mail app. WinPho 7 hackers, investigating the problem separately, claimed Yahoo! Mail's WinPho 7-centric IMAP servers were to blame.

"Yahoo! has offered to provide Microsoft a near-term solution for the implementation they chose," the company told us, "and is encouraging Microsoft to change to a standard way of integrating with Yahoo! Mail, which would result in a permanent fix.” ®

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