SMTP is installed in two of the WFEs.  Default location of SMTP folders is c:\inetpub\mailroot\. To achieve high availability, we are planning  to implement network shared folder as the default folders for both the SMTP in WFEs. Is it possible to implement? Please advise.

Hi Balaji,

Is this a Exchange server question or you are talking about IIS SMTP server.

What does WFEs stand for?

Not sure how are you planning to use a UNC path for high-availability.

Below are some "Clustering and High-Availability" options that you can follow:

Setting Up Virtual Servers for Clustering

https://technet.microsoft.com/en-us/library/cc786318(v=ws.10).aspx

Deploying IIS on a Failover Cluster

http://blogs.msdn.com/b/clustering/archive/2009/06/01/9674799.aspx