this is the message i am getting while attempting to change the default inbox / local folder destination

Yes, you can create a filter that moves all messages from inbox to a preferred folder.

No, I am asking about to change the default mail storage location to other than C Drive

Okay, that's a different question. What you're wanting is to store the account on a different drive. Easy to do. - exit TB - in File Explorer, locate your profile, probably at c:\users\yourID\appdata\roaming\thunderbird\profile\yourprofilenamexxxx-default\Mail - copy the account folder from there to another drive. - start TB - go to tools>accountsettings>account>serversettings - click the browse button and locate and select the location where you copied the account. - exit TB and restart TB, check that all is working ok. - exit TB - locate the original account folder on C and delete it. - done

It worked.

Thanks David

Glad to assist.