Office 365 - full access to delegated mailbox - via OWA / Webmail (including contacts)


Does anyone know if it is possible to grant access to someone else’s mailbox in Office 365 so that, using webmail, one can see full access to another users mailbox.

For example, let’s say we have, User PA and User Boss.

User Boss delegates entire access to her enter mailbox to User PA

However, User PA only has access to webmail.

Is it possible for User PA to access all the contacts, calendar, all the mail folders, etc. As if using full Outlook client?

As well as this, in our case two factor authentication will also be activated on the account, but this should not make a difference I guess.

Hope my question makes sense and thanks in advance.
IT Man200Asked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

In the newest OWA, introduced during the Office365 period, the upper right corner, click the person icon, it will have the "Open another mailbox" option.
This option is used if the person already logged in has full mailibox rights to the "another" mailbox. And therefore will have full access to the mail and contacts, as well as calendar.
There is no 2 way authentication factor that I know of though.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
IT Man200Author Commented:
OK I see.

Can I check, how do I make sure we've delegated it correctly. When I try and access my colleagues for test using method above I either get page not found, or that I have not had permissions granted and a broken smiley page. however I can access the inbox.
If you have access to the inbox, maybe it was a share from the user themselves (and hence, it's a share of that part only, NOT THE FULL MAILBOX). Full mailbox rights are done in the admin panel.
IT Man200Author Commented:
We managed this. With full access and with 2FA enabled. Many thanks
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Office 365

From novice to tech pro — start learning today.