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I'd suggest that you make one of your exchange servers the file share witness at your primary datacentre. 
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I'd suggest that you make one of your exchange servers the file share witness at your primary datacentre.

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I figured this out a while back, but he's correct this is handled by exchange and windows clustering.
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I figured this out a while back, but he's correct this is handled by exchange and windows clustering.

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I currently have a two node exchange 2010 cluster and I file share witness all in different data centers, both hosts run server 2008 R2 are apart of the same dag with fail-over work fine. &nbsp;I need to add a third node to the dag which also comes from a different data center but I'm having a few issues. &nbsp;One by adding the node I will violate the file share majority rules with an even number, three hosts and one witness. &nbsp;I considered removing the witness but this doesn't work, it Exchange 2010 will not allow it. &nbsp;I've considered adding a second file share witness but I don't believe that will work as the second file share witness only acts as a backup to the current active file share witness.<br />
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I have other thoughts, but apparently I may do better asking someone else. &nbsp;If you can please help!
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I currently have a two node exchange 2010 cluster and I file share witness all in different data centers, both hosts run server 2008 R2 are apart of the same dag with fail-over work fine.  I need to add a third node to the dag which also comes from a different data center but I'm having a few issues.  One by adding the node I will violate the file share majority rules with an even number, three hosts and one witness.  I considered removing the witness but this doesn't work, it Exchange 2010 will not allow it.  I've considered adding a second file share witness but I don't believe that will work as the second file share witness only acts as a backup to the current active file share witness.

I have other thoughts, but apparently I may do better asking someone else.  If you can please help!

Adding third node

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.