Microsoft graph and getting Office 365 mailboxes

Ammar Hasayen

hi everyone,

We have a home developed identity management system built on .net, and we want to be able to connect to Azure AD, and get basic information  about each user.

as we have users with mailboxes on premise and users with mailboxes in Office 365, we want to connect to Azure or Office 365 from our .net application, and see if that user has mailbox on Office 365. It is not enough to learn his email address. We actually need to know if he has a mailbox in Office 365 as knowing he has an smtp address might mean that he is on premise mailbox user.


I am looking at the Microsoft Graph documentations, and I am kind of lost here, how can I tell from the Microsoft graph that a use has actually a mailbox in Office 365?



Related Conversations
Tabs and Dark Mode
cjc2112 in Discussions on
35 Replies
Extentions Synchronization
ChirmyRam in Discussions on
3 Replies
flashing a white screen while open new tab
Deleted in Discussions on
14 Replies
Stable version of Edge insider browser
HotCakeX in Discussions on
35 Replies