Mail360 Data Manager web service not starting

PRODUCT AFFECTED:Mail360 Data Manager 
The ‘.net framework 3.5 features has to be enabled’ as mentioned in the Mail 360 DM Release 2.6.0.

Installation and Administration Guide Installing the [MAIL360 Data Manager Web Services] page 23 once enabled restart IIS server and then start client bus service.

NOTE:.NET 4.5, is preinstalled on Server 2012 but .net framework 3.5 needs to be selected as a feature when installing [MAIL360 Data Manager Web Services] page 23 some internal component within Mail360 DM v2.6 still run on .net framework 3.5. 
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UPDATED:  December 28, 2018