I am getting emaim using exchange server.
I want to convert that to pdf file without using 3rd party tool or invoke code…is it possible to do using assign stage or invoke method?
Unfortunately, not possible as of now. You would have to use 3rd party tool or invoke code.
Thanks,
Ashok 
I don’t think it is possible to convert Emails to pdf files without using 3rd party tool or invoking code. But depending on your email file type there are free tools available on the internet.
Although directly in a single activity isn’t possible, one of the ways of doing it using UiPath supported activities would be to copy the email text to a variable, use the UiPath.Word.Activities.WordExportToPdf package (can be installed from package manager), save the email text to a word document and then save it to PDF.
An example mockup without variables filled in would be:
