Can we have MSP2013 and OS365/C2R MSP versions installed on same workstation?
Release : All supported Releases
Component : CA PPM SAAS MICROSOFT PROJECT (MSP)
It's not supported for Clarity to have two different versions of MSP on a workstation even if they are the same installation type as this can cause issues with the MSP Integration.
Regarding OS365 and MSI combinations, see the following details from Microsoft:
See 100272 - Does Clarity PPM work with MS Project "365" / Click to Run versions?
See the below for some of the known KB Articles regarding issues/defects in working with MSP: