I have edited my question to make it more clear
I have a requirement where Non Salesforce Users want to record/track their Lotus Notes emails into Salesforce. BUT, they want to record in such a way that the email is recorded appropriately to contact/opportunity in Salesforce.
Example : The user (Non Salesforce) gets some appreciation note as a Lotus Notes email from manager/VP about a certain product. He wants to record it for a particular contact in Salesforce, is there a way to do it? Likewise, there are certain ongoing "projects" (again in Lotus Notes email) going on which they want to record as opportunity in Salesforce.
Please let me know if this is feasible out of box / any app exchange products available? If not, if someone can please advise on the alternatives.