Yep, it's Yahoo! Mail that's behind Windows Phone 7 phantom data bug

Summary:The secret culprit behind the Windows Phone 7 phantom data issue is ... *drumroll please* ... Yahoo! Mail.

The secret culprit behind the Windows Phone 7 phantom data issue is ... *drumroll please* ... Yahoo! Mail.

Windows Phone 7 guru Rafael Rivera confirms what insiders have been telling me for more than a week:

Scary. Yahoo is sending ~25 times as much data as it needs to. (This can also be read as: Your phone is downloading ~25 times as much data as it normally would, had you sided with another email provider.)

To workaround this, I strongly recommend Yahoo mail users reconfigure the phone to not transmit data via a cellular connection (Settings –> Cellular –> Data roaming options). As an alternative, you can set your Yahoo account to only Download new content only on manual trigger (Yahoo Mail –> Settings –> Sync Settings).

The problem is down to Yahoo’s IMAP server ( and the fact that it doesn't respond to FETCH requests correctly.

No word from Yahoo! on this yet.

Nice bit of sleuthing there Rafael  ... well done!

Topics: Enterprise Software, Collaboration, Microsoft, Mobility, Social Enterprise, Windows


Adrian Kingsley-Hughes is an internationally published technology author who has devoted over a decade to helping users get the most from technology -- whether that be by learning to program, building a PC from a pile of parts, or helping them get the most from their new MP3 player or digital camera.Adrian has authored/co-authored technic... Full Bio

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