Birthday missmatch one day and birthday contact is edited aswell

We have an Exchange 2007 server, and I have a user that sync Two Outlook MAC, one Ipad and one HTC Android phone, the problem is that when we adds in a contact his birthday, after a while (I don´t know when), the event appears one day before or one day after, and if you go into the contact, you can see that the birth date was also changed....

Which device is changing the birthday???....
All birthdays now are one day apart and this users is very angry because of that...

Can anyone help me?
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marpanetAsked:
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David AtkinTechnical DirectorCommented:
Do you know a rough time frame for when the dates gat reset?  I.e. a day? month? year?  

I would add a new test contact with its birthday details and monitor it over a period of time to see when it resets.  I'd then remove the calendar syncing from one device at a time to narrow down which device is doing it.
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marpanetAuthor Commented:
Sorry for the late reply...
I changed everything to Apple devices and i am going to test out if the problem still exists.
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marpanetAuthor Commented:
The solution that worked for me was to upgrade Exchange 2007 to Exchange 2013 with all the updates...
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marpanetAuthor Commented:
That´s was the only solution I manage to find.
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