Cannot find add in on Outlook

[Doug Gordon]

I'm using Office 365 and have an odd issue.  On Word and Excel, the Nitro Pro add-in seems to be working because I have a tab at the top of each that offers up different options.  In Outlook, however, this tab is not there.  This makes converting email messages into PDF's problematic.  I've found a workaround but would like to get it corrected.  My office computer works fine, it is just my home computer where I see this issue.   

I've tried to find an add-in but only found the nitro sign, that add-in did nothing.  

Thanks for the help, 

Doug