How can you sync the GAL to every users' exchange mailbox contacts folder?

I am looking to sync the GAL for an on-prem Exchange 2010 environment with the contacts list for every users' exchange mailbox.

We need all of the contacts in the GAL to be able to sync to mobile devices so that mobile users have access to phone numbers that are kept up to date in active directory. This will also remove the issues we are seeing where users do not know how to utilize the GAL and are keeping spreadsheets of everyone's phone number.

I have located a couple of paid services that will accomplish this, most notably CircaSync, but we are trying to avoid the use of third party tools. I also know we can get a little creative with an automated powershell script, but I am trying to avoid a jerry-rigged setup that is likely to become an issue to support down the road if it ever stops working once we are already reliant on it.

Who has accomplished this?
donsofoloAsked:
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timgreen7077Exchange EngineerCommented:
This can't be done natively but see the below expert-exchange link from another user that used powershell to accomplish this, but about from this or some third party app potentially this can't be done via exchange or outlook. See below link.

https://www.experts-exchange.com/questions/29110508/How-to-import-GAL-for-all-mail-enabled-users.html

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