When Yahoo! launched its implementation of IMAP for Windows Phone 7, it was quickly noted that there were issues with bandwidth usage caused by the app. Due to some errors in coding, a lot more data was being transmitted than actually was needed which in turn, caused a lot of users monthly allowances to be used up.
At the time this was first spotted, it was recommended to switch the collection frequency to further apart, or set to manual to avoid the automatic checking utilizing all the available bandwidth.
The Within Windows blog has now noticed that Yahoo! has updated the software that is responsible for collecting email via IMAP and found that the version has gone from 0.7.65_12.286037 to 0.7.65_14.298026. This newer version fixes the problem.
The exact fix is unknown, but when testing it was found that the fetch command only got a small reply back showing just the essential information, rather than the full header like before.
For those who use IMAP on Windows Phone 7, the fix is now already in place and you should see your data usage drop.
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