It's hard to understand what you mean by "one way". There was a point where Google stopped supporting Microsoft's proprietary protocols for mail (and calendar?) Not sure if Microsoft is yet to come with a fix, or whether even the same is related to your problem. 

On 24 May 2013 09:40It's quite hard to under
, Andrew Kerich <andykerich@gmail.com> wrote:
@George yes in Exchange which the device syncs to. The calender entries appear on the default Android calendar app one way...


On Thu, May 23, 2013 at 6:36 PM, george <theonlydamnedavailablename@gmail.com> wrote:

Is this calendar on exchange? and if so is the default android calendar not working?

On May 23, 2013 5:51 PM, "Andrew Kerich" <andykerich@gmail.com> wrote:
Hi Skunk(ette)s,

I require to sync outlook calender to a Samsung GT55570 running android 2.3.4
They sync works one way from laptop to phone but not vice-versa.
The solution should work without using a USB cable like in the case of Kies.

Rgds
Kerich

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