Ok, let’s assume that we are dealing with a troubleshooting scenario in which ActiveSync client report that he cannot connect to his Exchange Online mailbox. The meaning is that most of the ActiveSync client connectivity problems relate one way or another to the Exchange Online server! The method that we can use for verifying the ActiveSync client connectivity to Exchange Online mailbox The interesting thing is that the common assumption between Office 365 users and customers is that the opposite is true. I’m not saying that Exchange Online is “perfect” and, that there no chance for problems with Exchange Online infrastructure but most of the time, the Exchange Online problem related to another issue and not to ActiveSync client connectivity issues.
The less likely probability is a problem that relates to a “nonfunctioning Exchange Online mailbox” meaning a “bug” of Exchange Online, that prevents from ActiveSync client to connect to his Exchange Online mailbox. In my experience, 95% of the problem are related directly to the “realm” of the mobile device himself.Ī minor percentage refers to what I describe as – “office 365 administrative issues” such a scenario in which we didn’t assign a license to Office 365 user and, for this reason, he cannot connect to his Exchange Online mailbox. The following estimation is not based on a “scientific facts” or “formal research” but instead, only on my personal experience. A problem with a specific Exchange Online mailbox.Lack of availability of Exchange Online infrastructure \ services.Under this category, we can include causes such as:
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